CheatCodes.com has all the official Project Horned Owl PSX cheats to unlock everything. If you know of any that we don't have, please let us know.
All published and official codes as of Wednesday May 22, 2013 for Project Horned Owl are shown below.
Beat the game on the very hard difficulty level. Then, the following options will now become available: Polygon test (view enemies from any angle), Mission select, Movie test (view all FMV sequences), and Audio test.
Start a game in single player mode. Then on controller two just before losing your last life, press Start to gain three additional continues.
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