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Sony PSP - Valkyrie Profile Lenneth cheats

Unlock Seraphic Gate:
Finish the game, watch the credits and save when prompted. 
Go to the main menu and select the unlocked new options to  
access to the Seraphic Gate dungeon

Unlock Character art:
Go to the "Voice Collection" menu and unlock all entries for a character
Highlight that character, after that press Square button to view thier art

Get Tri-Emblem:
Finish the Seraphic Gate dungeon by beating Iseria Queen 

Unlock Book of Riddles:
Finish the Seraphic Gate dungeon by beating Iseria Queen 2 to 9 times
One book (8 total) will be awarded each time.

Get Angel Slayer:
Finish the Seraphic Gate dungeon by beating Iseria Queen 10 times 

Secret scene:
Finish the game with the "A" ending. When the credits end, there will be a 
scene involving Bramms and Lezard