Spectator Mode is toggleable by typing /spectate into chat. Both entering and exiting spectator mode is accompanied by a message in chat.
Spectators can see and hear other spectators and non-spectators, but non-spectators cannot hear nor see spectators.
Spectators are not affected by solid objects or gravity, can move around the map with WASD, and can use the Flame key to travel downwards. All of these directions are relative to the spectator's facing.
Upon entering spectator mode, the player's score is set to 0. While in spectator mode, the player does not earn any ¢, and a magenta "S" can be seen next to a spectator's name on the scoreboard.