[a] is an unreleased action-puzzle video game that was in development by Japan System Supply and planned to be published by Nintendo on a scheduled 1996 release date exclusively for the Virtual Boy.

In the game, players take control of a transforming robot named Chalvo through a series of levels riddled with hazardous obstacles to avoid across multiple worlds, while destroying or knocking out alien invaders off the area.

The project was first conceptualized by designer and programmer Hideyuki Nakanishi, who wrote the idea on paper and placed it within a wall inside the offices of Japan System Supply, with his manager eventually greenlighting its development after seeing it.

Despite its cancellation, a ROM image of the complete game was leaked online in 2010 by the hobbyist community at Planet Virtual Boy, allowing for it to be played.

The game's objective is to destroy or knock out enemies from the playfield and figuring out the best way to dispatch them while avoiding hazardous obstacles.

was conceived by Chameleon Twist creator Hideyuki Nakanishi at Japan System Supply, who worked as one of the designers and programmers on the project as an undergraduate student.

was first showcased to the video game press and attendees of Shoshinkai 1995,[2][4][5][6] and later had its rights purchased by Nintendo, which originally slated it for a February 23, 1996 release.

[11][12][13][14][15] It was slated for an August 26, 1996 launch in both United States and Japan;[1][16][17][18][19] however it was never released due to Nintendo discontinuing the Virtual Boy for being a commercial failure.

being cancelled, former Nintendo president Hiroshi Yamauchi called the game as "the most promising title" during his keynote speech at Shoshinkai 1995.

[28][29] Retronauts writer Jeremy Parish speculated that the release of Star Fox 2 on the SNES Classic could lead to Bound High!