Players choose from one of three basic BOTS and level up their character through gameplay and buying items with virtual credits called gigas.

When a boss is successfully destroyed item crates may drop containing random armor pieces to use or sell to other players.

The player who kills the most viruses is titled the "MVP" and receives a small experience bonus equal to the number of people in the group.

These levels reward approximately twice the normal amount of experience and Gigas, but are also far more difficult than usual to complete.

If a player is killed, various colored fuel-canister shaped items called "Botstract" will fall from their body, which can be collected, but serve no purpose in the game.

During events, a special boss can randomly appear in Sector mode, which has a higher rate of dropping item crates.

After thirty seconds, the bar reaches full capacity, and the player has the option to transform into a larger and stronger robot.

Skills are part of the Gear page on the shop menu, they are broken up into passive and active abilities, and can give the players an advantage in battle.

For example, the active ability "Ion Wave" allows the player to punch the ground and send a shockwave of lethal projectiles to take out surrounding enemies.

In later versions of the game, starting with revision 1007, GameGuard fails to halt when BOTS ends and continues to use computer resources and inject code into processes until the system is restarted.

This is often unknown to the end-user, as GameGuard masks its CPU usage by hooking Windows system querying APIs.

Despite the aggressive protection of GameGuard, cheating was rampant in the latter half of the game's lifespan, allowing players to use rule-breaking programs to generate items, gain invincibility, teleport, and in extreme cases, mess with other player's game sessions to trip their own GameGuard program.