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So I've posted this elsewhere, but...You probably, before announcing to the world that you are going to make an MMO, need to think about it. Here are some questions to help you, with an admitted heavy bias towards social virtual worlds and MMORPGs, as that's what I'm making.They're culled mostly from Bartle's "Designing Virtual Worlds", but also Raph Koster's "Theory of Fun", David Michael's "Indie Game Development Guide", along with Bartle's MUD-DEV-L archives, and other sources. Bartle, Koster, and MUD-DEV-L are prettymuch required reading. Without them, your answers may well kill your game.First, the real biggies. Community, and Economy. If you have not even considered the following questions yet, then you really need to go back to the drawing board until you can answer them in tediously boring detail.CommunityHow do you promote communities? Stickiness comes from friendship and loyalty to OTHER PEOPLE, not to the game (good comms, filtered comms, mutual dependencies [varying scale], teleport to friend, communal activities [storytelling], shared stuff [website/game property], jargon dictionary, play instruments (locked to same tempo), ways to relax, stake-holding[things they create - homes. stake is bigger the more control they have], encourage friendship, discourage oppression/miserymaking/griefing)How large should the communities be? (max size before fragmentation \~150, but smaller communities are way stickier) Guilds (huge is good, but causes problems where one guild becomes overwhelmingly powerful), parties (dozen max? complimentary careers encourage party formation), clans, secret societies, town councils... (intermediate size, for faction vs faction combat). There are advantages of both large and small communities - encourage both, in as many forms as possible to increase player stickiness. Avoid capping community sizes without a sound rationale.Related to the above how big are player-made towns, if any? Are there town councils, rulers, etc? Do NPCs get the vote?How do informal communities promote themselves to permanent, formal communities? This needs to be easy. But so does forming an informal community in the first place.How do hierarchies get promoted? Sure there're always reasons to lead, but what motivations to swear fealty? Public services? Shared glory? Shared threats?How do you make community members want to enlarge their communities? (having communities that require a mix of chars, or a critical number of the same type, is one way)Will you have tools for community members to pool knowledge etc and work together on projects to further the community - group websites, mailing lists, with tools to keep archives, to log what was said in game and display the logs, group property ownership, ability to decide their own structure...)Have you considered "matching services" - ways to help people with the same interests get around - the ability to mark yourself as looking for a group (or partner) or as "taken", or neither, the ability to mark your group as looking for a player.Do you know about, and will you encourage use of, third party communities (TeamSpeak, proxies, Skype, ICQ, Facebook, LiveJournal, Quora)? How will you integrate with them?EconomyHow persistent is the game? "no economy" only happens if there's no persistence.Will there be a supply and demand market? If you buy a baker's whole stock of cakes bar one, does his price go up? Can you then sell those bought cakes back to him for a profit and make the price drop again? And then buy them again? And...?Do you need an economy? If so, Closed or open? (Closed has no inflation; has market forces; economy-driven play. However, v hard to balance, v prone to bugs, not likely to be accepted, and too easy to gouge. Players ALWAYS break closed economies. Open economies ALWAYS go out of hand with inflation. Tying to a realworld economy to fix value means your economy is subject to RL currency variation [qv \\$US currently], and your world is seen to be "unfair" by poor players if you sell anything other than cosmetics and intangibles: (DVW p266): "pay very close attention to the likes of Achaea to see how to do it - it requires very careful balancing and attracts a certain breed of player.")Fixed or free economy? (aka "worthlessness" or "hyperinflation"?)Do you need an NPC economy? That is, where does the iron for swords come from? Dwarven miners? Are these NPCs? What about flour from bread? NPC farmers and millers? Who farms all those cabbages? What happens to them once farmed? Who buys them?Does persistency differ from region to region?How do you cull crafted objects?Do you ever reset the world?How will you deal with trash? Objects need to decompose. While stuff can reset "out of sight", well traveled areas are always in sight so won't reset. A mob needs to go and close the door. Trash collectors accelerate object decomposition, provide an amusing (cheap) target and toy for users, and gather non-decomposible stuff like quest items into one convenient area.Now some less head-bending ones. Still, if you can't answer the great majority of these questions about your MMO, what makes you think you're ready to start building it? Get back to designing, oh great Game Designer! *flog*Note this isn't a comprehensive list. But it should get you going in the right direction.MMO Appearance? (text, 3D, first or third person)Genre? (fantasy is about 90% of the market now)Where did I pull that statistic from? Find out your own statistics. Nick Yee's Daedelus project (28http://www.nickyee.com/daedalus/gateway\_intro.html28) is a major source here. Search for more. Know your audience.Do you have gameplay (quests, etc)? How important is it?Where will you fall on the "MUD/MMO genealogical tree"? Which will you take inspiration from? Which will you try to differ from?What codebase will you use? Will you biuild from scratch or use a tool? If so, which one? (33http://www.devmaster.net/engines/33 has a great list)What platforms will you support? Vista? XP? Other MS? Linux? MacOS? Consoles? Handhelds? Phones? Browsers?What pricing bracket/price point?Will there be constant change and improvement (expansion packs etc)?How long do you project your beta period will last? Long is good, means you can get >100kUsers in the first year of "release".Will the whole game have a designer-imposed story arc (eg adding/removing world elements monthly to show world progression)?Will you be being a single seamless world (asheron's call), or split into zones or even separate shards?Info vs immersion? Do you hit someone "for 25pts damage", "for half his health", "really hard"? In some cases you can offer options, and if data is ever sent to the client you can assume that people will end up knowing it somehow or other... but what's the default?"breakpoints" come from levels: level 1 people with 1XP and 999xp are the same, but someone with 999xp is far weaker than someone with 1000xp - only one more. There are also breakpoints where skills are used in levels, or where abilities come in once a skill hits a certain point. Are breakpoints bad? They bug some people, and affect the game: is a +1str item useful? Only if you're 1 below the next breakpoint.if chars can start at any age and age slowly ingame, you can end up with 12 yearolds more skilled than 80 yearolds. Is this a problem?Will you have "natural selection"? (character classes less used become more powerful, oft-killed monsters become less valuable and more resistant to the normal attacks)Will you have keys? if an area can be locked and people can hoard the key, they will, and charge entrance. Also, if someone goes in, locks the door, and dies... the area is inaccessible. Arctic has 1-shot keys that degrade over time once leaving the area.Is your design "making an MMO" or "porting a story"? It seems common to take a story (eg princess bride) and try to make everything in it possible in the game (eg poison immunity, improv weapons, wrestling). This will cause you much pain and sorrow as you attempt to accomplish hard tasks rather than accepting the limitations of the MMO genre.How complex do you want your AI to be? "call for help", "run away", "run for help", "send one of two guards to check stuff out", "relay a help call if you can't leave your post"... these abilities have been in some text MUDs for decades.Have you picked a familiar world, or got a license? (eg Camelot) These help advertising a lot. Yes your made-up world is great and deep ad wonderful: but nobody other than yourself cares about it yet. That, from a marketing perspective, sucks.Target market? How many MMO players are female? How many are over 35? Are these demographics you want? (answer: surprisingly many of both - and PvP discourages both)How much change can players make to the world? Never withdraw an ability to change!From the above two - where is the balance between "social" (freeform) and "gaming" (fixed rules)?What is your definition of "success"? (industry standard of success: 100k players by end of year 1)If you are unsuccessful, how do you get more people?If you are overly successful, how do you scale? How do you manage in the various cases of growth? (explosive; rapid but constant; exponential; none; highly variable; negative)Do you have NPCs? If so, can players distinguish them from eachother, and from players? If so, how?Do you have Gods? If so, can players distinguish? If so, how?What is the customer service plan? To deal with all incoming support queries, for every 100k users you will likely need \~10 support people 24/7, scaling more at peak times, and scaling with growth. That is, 80-160 fulltime support people per 100k users, plus management structure overhead.How to you prevent bugginess/poor testing? What is your QA plan? QA does not end at version 1.0.What are the essential world objects that the graphics guys MUST have complete by end of alpha?What are the essential world behaviours that the coders MUST have complete by alpha?What is your recovery strategy for hacks that go undetected for a long time?Do you care about bots and cyborgs and gold miners? Will you even have goldminable tasks?What do you do for the "elder game", once people have "won" (completed all available quests, maxed their stats, etc)?do you allow multiple characters per account? If so, min is 3, 5 is fine for most people. If you charge per character, then do you permit people to buy multiples? Griefers, mules and alt-trades tend to make up most alts. If names take up "slots" and can be traded or shared then you can manage them better than if one account maps to one name.Are names a valuable resource? If you answered "no", you're wrong. People will pay realworld money for specific names, to name-hoarders, if you allow this. If you don't, how do you prevent it?Do you sell window dressing, eyecandy items (pictures, furniture, clothes) or functional items that give a game advantage (+10 swords etc)? The latter risks backlash, unless managed right.permit descriptions? Downsides include inappropriateness, cliché, and preventing character development.What will your "admin's charter" or "player's bill of rights" look like? 22http://www.raphkoster.com/gaming/playerrights.shtml22How do you define and enforce concepts like ownership? (need to deal with object mixing, eg coins, object tracking, and punishing the thief not/as well as the eventual holder. A publicly visible "stolen" mark would be the best, along with a note of who owns it "Bob's horse (stolen)". But for miscibles this can get real complex: "bill's and tom's and jim's gold (somewhat stolen)" just isn't really feasible unless you track ownership of every part of a stack, or don't let stolen items stack.) Are there exploits available from having two of the same type of object that will not stack?What things could you expose players to that might get your asses sued? (theft, virtual torment, harassment, stalking, adult content...)What will your rules look like?How do you punish griefers?Naming - do you autogenerate or permit choice? If choice, what T&C do you put on names belonging to the continuity? (something like: "You have permission to choose any name you wish - but you may not get to KEEP a name we rule someone else to have a better claim to. If we remove the name for malicious impersonation or other griefing, you may lose not just the name but also the character, their possessions and/or the name slot. But if we must remove a name for other reasons, you'll usually lose nothing else, and be prompted for a new name next time you log on")People die. In real life, die. Four, maybe five people I have played with have verifiably died (what am I, the black spot?). How do you deal with PLAYER death rather than character death? Wills? Tributes? Legal issues of ownership?People fake death: "The single greatest cause of sudden death among beautiful, young, female players is that the guy who was role-playing them wanted an irreversible out". An Eve player changed his *entire* online identity (emails, IMs, website, facebook, absolutely everything) and claimed to have died... so that he could join another guild.How to reduce player loss & hook newbies? Welcomers, "wow" sfx and broad vistas, rewards for everything they do.What scale? intimate scale seems "friendly" to newbies, but huge scale seems immersive and awesome. your scale is huge, but they can start somewhere small, where players are clustered.What's your plan for "flash crowds"?Do all items have Purpose, or are some just decor? (I recommend not, but be consistent - if you can draw water from one well, then you must be able to from all - if you can fell one tree, then you can fell them all, etc.)settlements - all placed, or some random? How many? How do you encourage players to explore them?NPCs: how many, and what do they do? (Buy/sell/make stuff; provide services; guard places; get killed for loot; dispense quests/clues; supply background info; do stuff for players; sidekicks/pets; make the place look busy). Can any of these categories be killed? Do NPCs die of natural causes? Do they die of NPC/mob attacks? Do they get replaced if they die?Should players be able to do everything NPCs do, and vice versa? Yes, ideally. Where there are differences, they should be explicitly decided on for practical reasons, not accidental. So teleporter effects should be plugged into the economy. And NPCs may know teleport routes that PCs don't, and be able to join their group and summon them...Do you make disciplinary actions public? Do you have public executions? Jailings with no escape? These punish the character as well as the player - what if two characters were involved? What if both were the same player? Should this matter?What forms and methods of character development do you use? What skills, if any? Do you have levels? What do they do? How do they advance in both?The five senses - sight and hearing is implicit in the engine, taste can be described as a result of imbibing actions, smell and touch need to be from character and NPC responses: head from a fire causes a stagger back; a stench makes a grimace and "urgh!", sharp things cause a flinch, etc. "feel" and "smell" commands may be implemented too.Names - above-head floating tags, or just on mouseover, or just on "look"? What's the default? Can this be changed?The Hero's Journey. (DVW p434-443) He sees the beginning and end as IRL and the journey in the game, but does it have to be that way? Could the journey not be completed entirely ingame? If so that would give impetus to retire - not to mention a clear elder game.Can you/should you make players' houses look ratty if they don't visit often? Weeds grow; windows break and shingles loosen; windows get boarded up... it makes it sticky, makes them return. Like that Ds game IHow do they give the orders to do stuff offline? Queue up a list of orders? Or let them decide on login, what they did with their "offline points"? Or both?Where do they reappear when they reconnect? Where they left? Or the last transport hub they passed through (more realistic to others) or the nearest inn (charge money)/self-owned house?Privacy: do you have a snoop command? Can you move about invisibly? I think perhaps so, so long as a locked bedroom door is a locked bedroom door *even against invisibility spells and thieves' sneak skills*: while admins moving through public areas should be able to be invisible just to retain immersion and prevent them getting pounced by people needing help, inviolable privacy by consent should be hardcoded.Teleporting: teleporting reduces exploration and immersion. How much should you give? If you give summon/join, then someone WILL make a taxi service between major areas. If you give it a cost, then that's a good tax, but what are the downsides? Initially I thought "teleport to any friends" was so important that it should not be prevented (and has precedent in the wizards' trip to a beach): now I'm less sure.Gathering, crafting, trading fighting - what else is there for people to do, to earn a living? Performing? Politics? Jesters?you can't do this without volunteers, but at what time does this become work and require min wage?What hardware and internet connection will it need? (in '96, UO had more bandwidth than New York, M59 lagged Silicon Valley on patch days)Will you ever alienate the community by changing business plan (charging for what was once free)Poor marketing kills MMOs. What's your marketing strategy?Where do you get good graphics and sound assets?Where do you get good quest design content?Comedy (killed by repetition), crime fiction (kills co-op), romance(becomes sex) and lone hero(100k Harry Potters???) genres don't translate well to MMO. Is yours one of these? Rethink it.Are there any aspects of your game that can be done "to death"? (if they can, players WILL kill all mobs: what do you do once all mobs are dead? They WILL destroy all destroyable items: what do you do once all trees are felled?)What steps will you take to accommodate the different styles of player? (eg Bartle's paper, etc)How will you ensure anonymity between players? Will you even bother? (it's always good to do)Will you have Profiling? (giving people titles "Bob the thug", "bob the mayor-slaying thug", etc, as well as full bios autogenerated.)Where will you recruit your team? What team members do you need? What extra team members would be nice?What percentage of the day should be darkness? How long in real time does an ingame day last? Do you even have day and night? Seasons? How do these affect players, NPCs, etc?Magic, combat, etc: what can they do and how do they work?Do players aim with their mouse cursor, or simply by selecting a target? If the former, how do you find out if they hit without trusting the client?Are there projectiles? How do you deal with a collision with one? Or a dodge? Again, without trusting the client.Players and mobs - do they have collision detection against eachother? How does that work when both players and the server may all disagree on their locations?Lag and desynchronisation: how do you deal with them in combat? What happens when someone attacks a lagged person?Disconnecting in combat: how do you deal with this? It may be deliberate or accidental.OK, those were the easy but boring ones. Let's try some more interesting ones now....Sex - do you has it? Can the players has it? Yay!Death. This is a biggie. What happens when a player dies? There are a lot of options here, from "their 'death' counter goes up by 1 and they leap back up again and carry on" to "their character is permanently removed." Do not dismiss either end of the spectrum too fast. Players like permadeath, they just don't know they do.Do you need gods? Are gods "real" in the world? Who are they? What do they want? Where did they come from? Why are they here? What does worship accomplish for the player? What does a changing level of worship do to a god?What information will be available to the client? Eg if the client only knows what the player sees, then turning will give lag. If the client knows what is all around them, what monsters and how strong and what they are carrying... then the hacker will know this too, and will know whether to attack it. If it's too dark or foggy to see, the player can disable fog and shadows in the client. So generally, don't rely on stuff the client knows to surprise the player. For surprises, make monsters magically spawn near the player, etc, instead.What else happens while they are offline? Do their wounds heal? Do they do work on their crafting? Do they get charged for eating, replenishing their arrows, etc? Can they make a shoppinglist and buy it? (effectively a tax)? Do your employees/slaves/pets continue to do their jobs (running your business, getting paid wages)? If you get XP for their actions, do you while you are offline? Does training take place while you are offline? Can you travel while offline? Generally, anything boring should be doable offline - but online too, just for the hell of it! So the question is less "should this be doable?" but more "how much can you get away with doing offline? The limit should be set such that people can't just use offline alts as cash cows.Are there babies? PC, NPC or both? Can they be created? Sex? Pregnancy? Visible pregnancy? Does it affect abilities/agility? Can pregnant people be killed? Can they adventure or would permitting it be irresponsible? Is there abortion? Labour? Are they borne by PCs, NPCs, Male, female? From what age? How do they look - can they be "designer babies"? Breastfeeding? Can they be taken adventuring? Hit? Killed? Abandoned? Sold? Given away? Orphaned? Adopted? (generally games avoid babies even as cosmetic addons: however, they are VERY fulfilling and VERY expensive, so are sticky and an effective tax on parents...)Are there children? [(DVW p288) "Mud2 has a baby dwarf that players are strangely reticent to kill at least until it cries and wakes the other 50 dwarfs in the area"] Do they age? Can they be PCs? Can they be owned, sold, enslaved, hired? Can they be taken adventuring? Hit? Abandoned? Given away? Orphaned? Adopted? Dressed in "sexy" clothing? (I'd say maybe permit kids, very carefully, as without them a game can feel dead and lifeless. They add a TON of depth as NPCs: eg "children of Morrowind", and the Ultimas, and the annoying kid in Deus Ex)Pets? Pet Death? Injury? Breeding? Eating?What are your realworld liabilities? (RSI, addiction, starvation, loss of job, RL violence for VR reasons, suicide, grooming, prostitution [yes, RL sex has been sold for VR benefits, and children are most vulnerable: this was one reason why Korea passed a law restricting players to >18 in many cases])If a Spaniard interacts with a Canadian on a server in the US owned by a Bahamas company who's directors are in the UK... who's laws are they subject to? What laws may you fall under? How much do you cooperate with the authorities? How much do you protect the privacy of your users from them?Can people sell virtual stuff to eachother for realworld money? It will happen, but as a black or white market? Are you involved? What are the legal repercussions? How can you be scammed? How can players be scammed? Who legally owns them?Toilets? Abattoirs? They take up gameworld space, but the activities in them are less than desirable. Should they be abstracted? Also, if not, should players be able to use them to massacre animals, or to go to the toilet? Whatabout other unpleasant stuffs? Sewers prettymuch have to exist - where do they get filled from? Just storm drains and "pipes in the wall" that lead nowhere, since there are no realworld toilets?Blind/disabled players - how do you cater for them? Do you bother?Blind/disabled characters - are such PCs "PC"? Do you care? Can bodyparts be disabled? One eye? Both eyes? One or both legs damaged(can't run) or nonfunctional(can't move without wheels or a sled)? What can do this? Injury? Items? (heavy/cursed boots) Flaws? Does this affect commands? Can you "get" an item with no hands? "Mr. Anderson, what good is a phone call if you're unable to speak?" Allowing people to voluntarily cripple themselves for RP and character depth is a good thing. They must be able to undo it though. Undoing needn't be simple - it may involve a quest.The questions in this list are malleable - that's why they are questions, not rules.As it turns out, there are only three hard-and-fast rules for networked games:Never trust the client side.Never trust the client side.NEVER trust the client side.Complex though they are, once you understand these three rules, you'll understand why missile attacks that use physics are considered a Hard Problem.For a start, they make it trivial for users to script bots with ingame item scripts or with third party apps like AutoHotKey, that give them guaranteed headshots every time.This is why so many MMOs just work on the "select a target, and where you hit and what damage you do is calculated on the server based on their dodge, size, cover, etc; and your skill, weapon, proximity, etc" method. The client is just responsible for showing the pretty arrow flying wherever they clicked, but the foe's stats are affected only by the server.Other online games violate the second rule, or occasionally the third; they trust the client, then try to jump through hoops when people reverse-engineer the mechanism and figure out ways of scripting it with AutoHotKey or something. As an example, Elder Scrolls Online trusts the client about their vertical height. The result was that botters harvesting resources could create themselves a copy of the map with a lower ground level, and run from resource node to resource node *under the ground*, completely safe from attack.Once one person has scripted it, you must assume that your entire player base has scripted it, since scripts are easy to pass around. You might as well distribute the script with your game.At that point, your rules have changed from "click on a monster and potentially do some damage to it" to "click on a monster and automatically hit, and automatically do max damage to it". In which case, you really ought to have started with that rule in the first place, and saved yourself a bunch of work.You've got this far. You've read to the end. You skimmed a bit, I'm sure, but if you're a determined MMO creator, you will have read more than you skipped.I have been working on my own MMO since about 2008, but not in any determined way. Between whiles, I've got married, got a job working as Lead Programmer for another MMO, and since then got another job. Odds of my ever getting it out are minimal to none.But it can be done. Back in 1994, Dr Cat wrote an MMO called DragonSpires. Two years later, he wrote an MMO called Furcadia, which he still runs today. MUDs were the invention of basically a single guy, Richard Bartle (though once he'd written the first, countless others chipped in to help and join the fun!)People CAN write multiplayer games. Hell, I've written a multiplayer online game client and server myself, ThudGame (since dead). I've rewritten the Furcadia client in Actionscript, then again in HaXe. It's *doable*. But you have to be willing to put in crushing amounts of time. Use the MMO engines out there and save yourself a ton of time, so you can focus on the resources (models, textures, audio, story) and ignore the other stuff.And start. Start today.Project 1: make a simple avatar able to move around an area, for example WASD controller, with jump and duck, ability to navigate stairs up to a certain height up and down, and to auto-crouch under objects down to a certain height. If you are using an engine, hopefully this will all come for free.Project 2: Add one interactable object. Any interaction is OK: have it make a sound, or change shape when you click it or walk into it.Project 3: Add an NPC.Project 4: Figure out roughly all the resources you will need (unique NPCs, manipulatable objects, static objects; textures; sounds; speech if any; special code not handled by the engine) for a minimum releasable feature set: your version 1.0 beta. Figure out, from your first three projects, how long it'll take to make all these. Schedule that time in slices on your calendar, with attainable milestones every week or at most two weeks where you can sit back and add all you've made to your game and say "oh yeah, made a big difference there." Read up on Agile development, it will really help you; SCRUM is a good choice of project management style for greenfield development.Project 5: Release your project in alpha before you have even reached that. Feedback is good, but don't let it discourage you, nor distract you from your schedule. This isn't the time for bug-fixing.Start today. You can get Project 1 complete by the morning. Maybe even all of 1-3.