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Playstation - Heaven's Gate cheats

Unlock Kurara
Enter to arcade mode and highlight Nanase. After that, push 
Select, Up, Down, Down, L1 + L2, Start on your controller. 
Flashing screen will confirm the correct code entry.
Now highlight Nanase again. Press Start to select the 
the two versions of Kurara and two versions of Nanase.

Unlock Kyohya
First unlock Kurara. Then, go to the VS. mode and highlight Verny. 
Press Select, Left, Right, Up, Down, R1 + R2, Start on your controller 
to play as Kyohya. 

Unlock Devil boss
Finish the game on normal or higher difficulty settings 
using a character with an Angel alignment to play as Devil boss.

Unlock Angel boss
Finish the game on normal or higher difficulty settings 
using a character with a Devil alignment to play as Angel boss.