The 3rd Birthday is a third-person role-playing shooter co-developed by Square Enix and HexaDrive, and published by Square Enix for the PlayStation Portable. It was released in 2010 in Japan and 2011 in North America and Europe. The game is both the third entry in the Parasite Eve video game series, based on the titular Japanese novel, and a spin-off, having only a loose connection to events from past games. The game features a third-person shooter-based combat system with role-playing mechanics. A key mechanic is the Overdive ability, which allows the player to possess pre-positioned human allies and inflict damage upon enemies.