22 (called TEST WATER by VanaSWE back in 2012) is the first mysterious track in the game. It comes directly after FINISH. The game always spawns the player above the water, which makes it impossible to explore the track. If a model viewer is used, it is revealed to be CHECKER BOARD.
This track has a timer "programmed in", like 23 and FE. The timer can only be seen once; all other races will instantly end even without GameShark codes.