Game Modes

There are currently five game modes in Diep.io.The game modes in order are: FFA (Free For All), Team DM (Team Deathmatch), Domination, Tag Mode and Mothership. There will be more game modes implemented in the future.

You can change game modes while not in the middle of playing one by pressing Tab on your keyboard.

FFA (Free For All):
You spawn into the arena at Level 1, a basic tank ready to explore and work your way to the top. You are blue and your bullets are blue. All enemy tanks are shown as red with red bullets. There are no teams in FFA, but you can side and betray with anyone you want. Just remember they can do the same to you. The only goal in a Free-For-All is to work your way to the top of the leaderboards by any means necessary. To get experience, kill any enemy tanks or Polygons. This was the first and only game mode in Diep.io for a while, before TDM was announced.

Team DM (Team Deathmatch):
Your level one tank spawns as either a red or blue tank in a designated area at the side of the map (blue in the left side, and red in the right side). You gain points the same way as in FFA, but you can't destroy tanks of your same color. Only red tanks can destroy blue tanks, and vice versa. You can be destroyed either by a tank of opposite color, by getting too close to the enemy's spawn area where the Guardians there will swarm and kill you, or if you hit a polygon. Any bullets that travel in the opponent's base will disappear. This also prevents spawn killing, unlike FFA. The main goal is to have everyone on the leaderboard be on your team. On the leaderboard, it also shows what color each player is. The game has no win condition despite the listed goal. Team Deathmatch was added on May 29th, 2016.

Domination:
A game mode very similar to Team DM, as you work together with teammates and each team has their own assigned spawn areas, but with some catches. Two teams compete for control of four Dominators located on the map. They are very powerful, and can destroy any enemy within its range. They will attack you and your teammates if it has been captured by the enemy team, or if it is neutral. Neutral Dominators are colored yellow, enemy Dominators colored the enemy's team color, and ally Dominators are colored as your team's color. To capture the Dominators, players have to deal damage to them until their health bars are depleted. But if they're the other teams Dominator, you must destroy it two times. However, it'll only change to the color of the tank that deals the last blow. Once a team claims all four Dominators, the game ends and Arena Closers spawn to shut down the server. Leveling up in this game mode is quicker, as XP gain has been doubled to speed up the game. This is the first game with a win condition. Domination was added on June 2nd, 2016.

Mothership
A game mode similar to Team Deathmatch and Domination, but both teams have a Motherships. Motherships are controlled by players, and switch off the person in control every few minutes. The blue team has to destroy the red team's Mothership, and the red team has to destroy the blue team's Mothership. Leveling up in this game mode is very quick, as XP gain has been tripled to speed up the game. Just like Domination, if one of the teams win, the Arena Closers come in and get rid of the players and start a new server. Mothership was added on June 15th, 2016.

Tag Mode
A gamemode similar to Team Deathmatch. Your level one tank spawns at a random place as either a red or blue tank, and you try to destroy other players in a "FFA Map". If you die, you will respawn on the team that killed you. The leaderboard shows the number of players each team have. Also, the arena gets smaller when time elapses, at around a rate with 12-13 seconds.

Trivia

 * In Team DM, Domination, Tag Mode and Mothership, the color of you will represent what team you're on. This also includes the color of the drones you spawn, and the bullets you shoot.
 * A neutral Dominator shoots giant yellow bullets (Similar to a Destroyer's), and it can one-shot just about any player tank.
 * When a game ends in Domination, Mothership and Tag Mode, very tough entities called Arena Closers will spawn and destroy all remaining players in the server.
 * In older updates, you would be taken to an entirely new server at the end of a game of Domination or Mothership, but as of an update in late June-early July the server is just reset and the map is renewed.
 * After Tag Mode was removed due to lag issues, the devs decided to bring it back at 15th of August.
 * It was like Team DM, but without spawn zones, and when you got killed by the other team you became part of that team, keeping all your upgrades. When all players belonged to one team, that team won.
 * As of July 20th, you are blue and everyone else is red in FFA.
 * The locations of bases in Domination change within each server.