R-Gear
A cancelled follow-up to Taito's 1994 shooting game Rayforce that was shelved in favour of development of Raystorm - a single stage prototype for the game was made but was formerly unreleased bar for some screenshots and videoclips.
As part of the Ray'z Arcade Chronology the prototype build consisting of a single stage was released as a bonus standalone game, featuring new music from series composer Tamayo Kawamoto.