In the game chat, type one of the following:

/back 0 – turns off the game background

/mute 1 – mutes music

/seizures 1 – “induce seizures” mode

/turbo 1 – turns on the “turbo” mode

/endround – ends current round in Practice mode

/fps – displayes current Frames Per Second info

/recorder 1 – turns on the “Game Recorder”