(last update - Jun 04 2013)
Total current cheats: 3
print meDebug Menu
You'll need two controllers hooked up to the console while the game is first booting in order to perform this code. Enter Up, Down, Up, Down, Left, Right, Left, Right on Controller 2 when you see the Sega logo at startup; a sound effect will play if you entered the code successfully.
This unlocks the debug menu where you can view monster sprites and animations, as well as unlock options for setting time limits. Exit the debug menu by pressing the Mode button on Controller 1.
print meDebug mode
Press Right, Right, Right, Left, Left, Left, Left, Right, Right, Right, Left, Left, Left, Left on the mode selection screen. Hold Select and Y on controller two and press Start on controller one.
print meExtra continues
Press Start on controller two when losing your last life. Game play will resume with a new monster with all continues.