This one is best for at least 4 players because of the large playing surface. There's also a hidden jump that gives you another access to the rumble. If you get lag kicked or pushed off, it's a little tough getting back on. Just remember to get enough speed. It would be a trip to play this one with 8 players!
Mr. Ashtray
Hightime by Mr_Ashtray
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MrAshtray