Nebulus is a platform game created by John M. Phillips and published by Hewson Consultants in the late 1980s for home computer systems.

A notable feature of the game is that when Pogo walks left or right, the tower behind him turns clockwise or counterclockwise with a convincing sense of depth.

The Game Boy and Nintendo versions were later released in Japan as Kyoro Chan Land, which replaced Julius with Kyorochan, jewels with Chocoballs, altered the enemy graphics and (in the Famicom version) implemented a password system and a pause feature.

The C64 DTV version made comeback on the Wii's Virtual Console download service in Europe on June 13, 2008 and later in North America on May 4, 2009.

stated that the Commodore 64 version of Tower Toppler had "good arcade action, with well-executed graphics".

[7] Orson Scott Card wrote in the magazine that "the graphics are terrific ... As science fiction, it's fun, but shallow.

[11] The ZX Spectrum version was rated number 30 in the Your Sinclair Official Top 100 Games of All Time.