| This is a historical feature that has been removed from the game. As such, it is no longer found in-game.
SID is a Hostile Mob and the second Boss in MooMoo.io.
Sid, acting as an almost complete clone of MOOSTAFA, is able to be killed in the exact same manner. The strategy can be found here.
- Sidney de Vries is the game developer, making this the second time he has been referenced in the game, the first being one of the many Cow names the game can spawn in.
- 1.5 - Removed ("Now only appears on special occasions")
- 1.3 - Added SID