Then you will be teleported to cool designed room. You can find there some teleports and levers.
You can choose the difficulty of game. Hard is the fastest, medium is... medium, and easy is easy... - you know - for noobs.
When you use the lever you will be teleported to arena. You can move snake by pressing CTRL + Arrows. Your objective is to get cake and dont hit walls or snake itself.
After you crash (everyone crashes... at last) you will be teleported back to first room and you will be notified how many points you got.
You can also use /snake_points to see the ranking for Snake Game.
You can also go to Audience teleport and observe other players.