Spleef 1v1 Arena 3 or more Players.

Your username: _Matrix_
In which minigame/server does the bug occur: Spleef
Detailed description of bug:
You are able to block glitch into the numbers 5 and 6 Sumo 1v1 Arenas.
You do this by joining the Main Spleef Arena, then leaving. You're then able to break block but having them be replaced almost instantly. You can then, in some spots, glitch into the spleef arenas making it possible to have 3 or more people in the 1v1 Spleef Arenas.
This could be fixed by placing a block under the glitchable blocks.
Here are where the glitchable blocks are.

Spoiler: Glitchable Blocks