Game modes in Open Fortress include deathmatch, Capture the Flag, and duel. In the deathmatch game mode, players move quickly around the map, trying to kill as many opponents as possible. Weapons and powerups are available around the map. The gameplay of deathmatch is based on Quake. In Capture the Flag, players attempt to bring the objective from the enemy base to their own while preventing the enemy from the doing the same. Variants of the game mode are played with the deathmatch mercenary, the mercenaries of Team Fortress 2, or both. Duel is a game mode where two players fight in an arena until a certain number of kills is achieved. This is similar to the unofficial game mode of MGE in the TF2. Other game modes include arena, where players do not respawn and each team attempts to wipe out the entire enemy team, and arsenal, where players face off against waves of computer-controlled enemies.