Gish

Gish cheat codes: 
Level select:
Beat the game on normal or higher difficulty.

Warp to Mario level 1-2:
On level 1-3 Bash through the 1st set of spikes to
the left of the 1st suspended platform fall down the
passage and break the Question mark block to warp.

Warp to Pac-man:
On level 4-4 right before the collapsing pillars
climb under the 1st overhang and break through the wall,
fall down the passage and into pacmans mouth to warp.

Warp to Pitfall:
On level 2-1 pull the 1st vertical platform to the left,
climb the ceiling and drop down using heavy to break through
the ground fall down the passage and into a room with a giant
pitfall Harry sprite to warp.

Warp to the isle of the dead:
On level 3-4 in the room where the skulls fly out of the
ground run and grab onto the 1st skull platform that shoots out,
ride it up into the air till you see a platform marked 666,
jump to that platform to warp.

Satans layer:
Complete isle of the dead.

Super hard mode ( ludicrous ):
Beat the game on hard difficulty.

Mini mode:
Beat the game on ludicrous difficulty.

New vs Levels:
Beat the game on normal or higher difficulty.

New vs Mode:
Beat the game on hard difficulty.