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Frets on Fire (abbreviated 'FoF') is a Finnish music video game created by Unreal Voodoo in which players use the keyboard to play along with scrolling on-screen musical notes to complete a song, and is a clone of the Guitar Hero video game series. Frets on Fire was the winner of the Assembly (demo party) 2006 game development competition.

Frets on Fire is free and open-source software. The game is written in the Python programming language and is licensed under the GNU General Public License, though the game incorporates other free and open-source code under other licenses. The game's included song files and some internal fonts are proprietary, and their redistribution is not permitted.

The gameplay of Frets on Fire is similar to Guitar Hero - the player emulates playing a guitar. Frets on Fire is meant to be played by picking up the keyboard like a guitar, with one hand pressing the fret buttons and another pressing the pick button. There is support for joysticks however, meaning that the Guitar Hero controllers (with the appropriate adapter and/or software) can be used as well.[5]

Colored markers appear on the screen, synchronized with the song, and are played by holding the fret buttons of the correct color (F1 through F5) and pressing one of the pick buttons (Enter or Shift) at the correct moment. Every ten correct hits increase the score multiplier, which multiplies the points for every hit by up to four times. The multiplier is reset in case of a miss.

Since version 1.2.438, the game features hammer-on and pull-off notes(commonly abbreviated to HOPO(The game refers to them as "tappable notes")). A HOPO note allows the player to press only its fret button to play if the previous note was played correctly. Bugs were found in the new gameplay element, and version 1.2.451 fixed them, along with adding an option to disable HOPO notes.