Muppets Party Cruise Cheats

When in short cruise mode, highlight an unlocked game. Then, instead of pressing X (which would select that unlocked game), press X + L1 + Right to unlock the game to the immediate right of the highlighted game; X + L1 + Left to unlock the game to the immediate left of the highlighted game; press X + L1 + Up to unlock the game immediately above the highlighted game; or press X + L1 + Down to unlock the game immediately below the highlighted game.

I discovered this myself:
To play a "locked" game in the "short cruise" mode: When in the "short cruise" mode, highlight an unlocked game. Then, instead of pressing X (which would select that unlocked game), press X + L1 + [right arrow] to unlock the game to the immediate right of the highlighted game. Or press X + L1 + [left arrow] to unlock the game to the immediate left of the highlighted game.
Or press X + L1 + [up arrow] to unlock the game immediately above the highlighted game. Or press X + L1 + [down arrow] to unlock the game immediately below the highlighted game.

When in short cruise mode, highlight an unlocked game. Then, instead of pressing X (which would select that unlocked game), press X + L1 + Right to unlock the game to the immediate right of the highlighted game; X + L1 + Left to unlock the game to the immediate left of the highlighted game; press X + L1 + Up to unlock the game immediately above the highlighted game; or press X + L1 + Down to unlock the game immediately below the highlighted game.

When in short cruise mode, highlight an unlocked game. Then, instead of pressing X (which would select that unlocked game), press X + L1 + Right to unlock the game to the immediate right of the highlighted game; X + L1 + Left to unlock the game to the immediate left of the highlighted game; press X + L1 + Up to unlock the game immediately above the highlighted game; or press X + L1 + Down to unlock the game immediately below the highlighted game.