Quarth (クオース) is a hybrid puzzle game with 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, Famicom, and Game Boy—home releases used the Quarth name worldwide. In 2005 Konami also included the game in the Nintendo DS title Ganbare Goemon: Tōkai Dōchū Ōedo Tengu ri Kaeshi no Maki.