The very basics of Wiki Warfare, is that every player has their character sheet generated per-match, entirely out of 5 randomly selected articles from wikipedia and various smaller, more focused wikis.
Articles are generally listed on your character sheet as such:
Avatar: A somewhat newer addition to the Wiki Wars format, this is always the first article on your sheet. The Avatar is the Who/What you play as, and is heavily biased towards things that could be reasonably defined as a person or person-like. For instance you will never wind up as something incapable of thought such as an animal, however something with a more limited ability to think and adapt, like a robot, could be more likely. Your Avatar will naturally contribute other things to your sheet as well, things like their signature weapon, some of their known powers, bonuses to certain courses of action, or possibly a close companion.
Abilities: These are, quite simply, powers. Things that your character can do that the average character couldn't. Capabilities beyond the mundane. Just because you don't have it as an ability doesn't necessarily mean you can't do it, but at the same time you shouldn't necessarily expect that you can do anything and everything your Avatar was canonically capable of. Abilities may also have uses beyond what is explicitly described. For instance, you can use a fireball spell to do more than just attack people.
Allies: Somewhat self explanatory, an ally is another character who is aligned to yours. These characters are NPCs, and while you can give them orders, they may not act on them as you intended them to, or could even outright refuse. It all depends on who and what the characters in question are. Something like a simple beast won't resist your orders, but they may simply not understand what you want them to do. Additionally, if you are rendered unconscious and have Allies who fit the qualifications for an Avatar, you are allowed to play as one of them(selected at random if you have multiple) until you Avatar wakes up. You will still lose if your Avatar is completely removed from the fight however.
Assets: Assets is a rather catch-all term, which basically just refers to any physical object in your characters possession. A weapon, armor, food, vehicles, anything that has a physical presence but is not capable of acting independently qualifies as an Asset.
Additional: Other things. In some games this is listed as 'misc'. Additionals are just features that don't really fit into any of the other categories, generally stuff related to NPCs interactions with you, rather than to you yourself.
The other two are Maps(which determine the location the battle will take place in) and Modifiers(which alter the conditions of the map)
Finally, it is possible to gain new articles by doing certain things. The only surefire way to do so is by killing another player(or otherwise permanently removing them from the battle, such as physically removing them from the battlefield in such a way that they cannot reasonably return in the duration of the match, say, launching them out of an escape pod on a space station). However other ways may become available depending on the gamemode, map/modifiers, or your own character.
Speaking of Modifiers, they're effectively a new article type, meant to spice things up a bit. Maps can come with Modifiers built in, but anywhere between zero and two modifiers will be rolled at the start of each match, which can alter the conditions of the map.
Actions in this game, while you are free to do anything within reason, have their outcomes decided by the roll of a d10, modified by things such as your skills, the ease of the action, and the conditions under which you are doing it. Particularly simple actions, such as moving to a location you can see or picking up a light object that you can reach don't require rolls at all normally. However circumstances can turn even the simplest action into something you could reasonably fail at.
Combat is determined by two opposed d10s, with modifiers. With the effectiveness of the attack not being simply 'how much higher did you roll', but rather 'how high did you roll and was it higher than them' where rolling a 9 v 8 will cause you to do more damage than a 5 v 4. Getting 4 or more higher than your opponent if you are the one being attacked will cause you to counter attack if you are able(can't exactly hit a sniper when you're a block away with just a sword). Damage(generally) uses a 'chunky salsa' system, where instead of saying '20/30 HP' it would be something like 'Wounds: bleeding bullet hole in stomach'.
You can only perform 2 actions per turn(excluding having your allies do things), plus a Bonus action if one of those actions is something exceptionally quick and simple, such as moving a few feet or picking up a light object within that range.
Reloading also functions on a system of logic, where whether a weapon takes one or two actions to reload or falls under the bonus action depends on how long it would reasonably take to reload that weapon. Also, in the intention of keeping things simple, ammo is being treated much more simply here. You can generally expect any weapon to take ammo from similar enough weapons(mundane shotguns with shells, bows with arrows, mundane rifles with rifle rounds, ETC.)
Actions can be made private using spoilers, but you should only do so if you have a good reason why the other player characters present shouldn't be able to see them being done. Such as if it's done with a Stand and none of the players nearby can see Stands
Lastly, we have gamemodes. These determine how one wins in a match. With some gamemodes, the exact objective varies based on the map and modifiers. The gamemodes are as follows:
- Classic: The original gamemode, from the very first game, back when it was Wikipedia Warfare, and Wikipedia itself was the only source of articles. In this gamemode, the objective is to gain points. Points are gained by killing a player, or an equivalently powerful NPC. When you kill another player, you gain half of their points rounded down, with a minimum payout of 1. Gain 10 points, and you win. Every time a player is defeated the next player on the waitlist is brought in to replace them. This continues endlessly until finally one player wins.
- Deathmatch: A very simple gamemode. Just defeat all of the other players. Last player standing wins.
- Team Deathmatch: Similar to Deathmatch, except players are separated into two teams instead of just being a free-for-all. You can communicate privately among your team with spoilers, but actions should be made public if there isn't a good reason why the enemy players wouldn't see it. Last team standing wins.
- Assassination: In this gamemode rather than fighting against other players, you are both cooperatively and competitively trying to kill a specific NPC. The exact NPC depends on the Map and Modifiers.
- Objective: Similar to assassination, in this game mode you have a map-based objective that you must complete, rather than just killing enemy players or defeating a boss.
- Team Objective: Like Team Deathmatch, for the objective gamemode. Two teams compete to achieve either the same objective(Such as capturing a location), or opposing objectives(such as one team defending a target while the other tries to kill them).