In The Hunt Codes -

Level select:
Highlight "Start" and press Up/Left + Circle + Select. A level selection menu will allow any level to be played, any of the four endings to be viewed, and a two player Vs. mode game to be started.

Speed up:
Pause during a game. Hold Triangle + R2 and resume the game.

Slow down:
Pause during a game. Hold Triangle + L2 and resume the game.

Unlimited continues:
The game still counts down from ten to zero after all continues have been used. Press Triangle + Select + Start during the countdown for five more continue credits.

Extra lives:
Press Start on controller two immediately before losing your last life. Extra lives will be available for continued game play.