P.N. 03 Cheats

Blackbird Suit
Successfully complete the game under the easy or normal difficulty setting to unlock the Blackbird suit. It is maxed out on every level and has three super moves from the start. You cannot change those moves or upgrade the suit. You also get a new title menu when you unlock this suit.

Papillon Suit
Successfully complete the game a second time on the same saved game file. This suit is also maxed out but has no barrier; one hit and you are dead. However, you will get to see a lot more of Vanessa. You can also now assign what super moves you want your character to have at each portal and in the inter-mission menus. When you unlock this suit you also unlock a new title menu.

Better ending
Successfully complete the game under the normal difficulty setting to get an extra conversation between Vanessa and "The Client"; a new end screen saying "Game over...", and a new title menu.