Progear, released in 2001, is a horizontally scrolling bullet hell arcade game developed by CAVE and published by Capcom for the CP System II board. Set in the fictional kingdom of Parts, players control children piloting a plane equipped with the titular propelling engine. Their mission: overthrow the Metoruin sages and their new world order. Progear features steampunk-inspired anime visuals, intense bullet dodging, and massive bosses.