Hotaru no Nikki - Hotaru no Nikki is an Adventure-based, Puzzle-Platform, and Single-player video developed by Nippon Ichi Games.
Clone Hero - Clone Hero is a free rhythm game, which can be played with any 5 or 6 button guitar controller...
WarriOrb - WarriOrb is a Side-scroll, Metroidvania, and Single-player Souls-like Platform video game developed by Not Yet and published by Maple Whispering Limited.
Osu - Osu is Music, Rhythm, Single and Multiplayer video game developed by Dean Herbert.
A Boy and His Blob - A Boy and His Blob is Action-Adventure, Puzzle-Platform, Fantasy-based, and Single-player video game developed by WayForward Technologies and published by Majesco Entertainment.
StepMania - Rhythm game for Windows, Mac, and Linux.