Scramble Formation (スクランブル・フォーメーション, Sukuranburu Fōmēshon) is a vertical scrolling shooter game released by Taito in Japanese arcades in 1986. It was released by Romstar in North American arcades under the name Tokio.

Space Manbow is a shoot 'em up video game developed and published by Konami for the MSX2 and MSX2+ home computers in 1989. It was later re-released for mobile phones on September 1, 2006; for the Nintendo Wii's Virtual Console service on November 24, 2009; on February 19, 2014 for the Wii U; and on July 28, 2015 for the Windows Store (Project EGG). It has never been released outside Japan.

Quarth (クォース, Kwōsu) is a hybrid puzzle game/shoot 'em up developed by Konami which was released in 1989 as an arcade game, sold as Block Hole outside Japan.

Besides the arcade version, there were also ports of the game to the MSX2 (with a built-in SCC chip), Famicom, and Game Boy—home releases used the Quarth name worldwide (with the exception of the Game Boy Color release in Europe of Konami GB Collection Vol. 2, where the game was renamed to the generic title Block Game for unknown reasons).

Quarth was released on the Konami Net i-mode service as Block Quarth, with an updated Block Quarth DX in 2001. It was released without the "DX" suffix in 2005, and was made globally available through Konami Net licensing on many i-mode services offered by mobile operators. In Europe, for example, it was available from O2 UK, O2 Ireland, and Telefónica Spain.

In 2005, Konami also included the game in the Nintendo DS title Ganbare Goemon: Tōkai Dōchū Ōedo Tengu ri Kaeshi no Maki. An emulated version of the game was released in 2006 for PlayStation 2 in Japan as part of the Oretachi Geasen Zoku Sono-series.