Rabi-Ribi is a 2D Metroidvania-style platformer with bullet hell elements, developed by CreSpirit and published by Sekai Project. It was initially released for Windows in 2016, with later ports to PlayStation 4, PlayStation Vita, and Nintendo Switch. The game follows the story of Erina, a rabbit who mysteriously transforms into a human girl with bunny ears. Players guide Erina through a vast, interconnected world as she searches for her missing master and uncovers the secrets behind her transformation. Key features of Rabi-Ribi include: 1. Non-linear exploration typical of Metroidvania games, with ability upgrades unlocking new areas. 2. A combat system that blends melee attacks with bullet hell-style projectile dodging. 3. An extensive boss roster featuring over 20 unique encounters. 4. RPG elements including leveling, equipment, and character customization. 5. Multiple difficulty settings and game modes, including a Boss Rush and speedrun-friendly options. 6. A chiptune-inspired soundtrack by composer Bunny Bandit. 7. An expansive map with over 9 main areas and numerous sub-areas to explore. Rabi-Ribi is known for its challenging gameplay, particularly in boss fights, which often require precise timing and pattern recognition. The game also features a unique "0% run" possibility, allowing skilled players to complete the game without collecting any items or powerups. For fans of the Metroidvania genre, Rabi-Ribi stands out for its bullet hell elements and its cute aesthetic, which contrasts with its often demanding gameplay.