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Dreamcast - Legacy of Kain: Soulreaver cheats

Pause the game, then hold L or R and press the following button combinations:
If the code is accepted you should hear a sound.

All abilities (climb, swim etc.)
Press Up, Up, Down, Right, Right, Left, B, Right, Left, Down. 

Aerial Reaver: Press A, Right, Up, Up, Y, Left, Left, Right, Up.
Climb wwall: Press Y, Down, X, Right, Up, Down.
Constrict: Press Down, Up, Right, Right, B, Up, Up, Down.
Fire Glyph: Press Up, Up, Right, Up, Y, X, Right.
Fire Reaver: Press Down, Up, Right, Up, Down, Left, B, Right, Down.
Force Glyph: Press Down, Left, Y, Down, Up.
Force: Press Left, Right, B, Left, Right, Left.
Full health: Press Right, B, Down, Up, Down, Up.
Full magic: Press Y, Right, Down, Right, Up, Y, Left.
Go through barriers: Press Down, B, B, Left, Right, Y, Up.
Hurt Raziel: Press Left, B, Up, Up, Down.
Kain Reaver: Press A, B, Right, Y, Left, Left, Right, Up.
Make Fire Reaver: Press Y, Right, Down, B, Up.
Refill magic: Press Right, Right, Left, Y, Right, Down.
Restore health: Press Down, B, Up, Left, Up, Left. 
Shift any time: Press Up, Up, Down, Right, Right, Left, B, Right, Left, Down.
Soul Reaver: Press Down, Y, X, Right, Right, Down, Down, Left, Y, Down, Right. 
Sound Glyph: Press Right, Right, Down, B, Up, Up, Down.
Stone Glyph: Press Down, B, Up, Left, Down, Right, Right.
Sunlight Glyph: Press Left, B, Left, Right, Right, Up, Up, Left.
Upgrade health to next level: Press Right, A, Left, Y, Up, Down.
Water Glyph: Press Down, B, Up, Down, Right.