Kanon (PlayStation 2)

Kanon
Developers: Key, VisualArt's Publisher: NEC Interchannel Platform: PlayStation 2 Released in JP: February 28, 2002, December 22, 2004 (Best Edition) This game has debugging material. This game has a hidden sound test. This game has a hidden level select.

Uguu~

Debug Mode

With the below code on, selecting デバッグ (debug) in the pause menu will turn on debug mode. This will unlock everything in the game, display debug information on-screen, and will open a debug menu when starting a new game.

SLPM-65842 codes:

Master Code (only needed for cheat devices)
901ACFB8 0C06B396

Enable Debug Mode
202164D0 00000001

(Source: Original TCRF research)

Debug Menu

Starting a new game with debug mode active will present you with this menu. This allows you to view various scenes.

Progressive Display Mode (640x480p)

Holding Triangle + X when the game is first starting up will allow you to turn on progressive mode.