The 3rd Birthday for Sony PSP is an action role-playing game with a third-person shooter perspective. It follows series protagonist, Aya Brea, a special agent battling monstrous creatures known as 'the Twisted' who have invaded New York City. Blending RPG elements with intense gunplay, players unravel a complex story involving time manipulation, body possession, and a fight for survival. Unique to the game is the Overdive system, which allows Aya to transfer her consciousness into allies for strategic advantages during combat. The game is a spinoff of the Parasite Eve series.