J
S
S
S
G
C
W

J = Jazz Start Pos.
S = Down Sucker Tube.
G = Regenerating Gold Coin.
C = Coin Warp (needs five coins) that leads to the main level.
W = Warp which leads to an isolated box.


In theory that should work, though splitscreen and lag are a dangerous thing, so I doubt it'll be foolproof.