Amplitude is a 2003 rhythm video game developed by Harmonix and published by Sony Computer Entertainment for the PlayStation 2.

Compared to the original Frequency which used more electronica and trance music, Amplitude included additional pop rock songs in its soundtrack.

In 2014, Harmonix successfully offered a Kickstarter campaign to raise over $840,000 in funds to build a new Amplitude game for PlayStation 3 and 4 consoles; the reboot was released in January 2016 under license from Sony.

In Amplitude, the player controls a ship (referred to as a "Beat Blaster") moving down a path of varying shapes and lengths, containing up to six tracks.

Each color-coded track corresponds to a different aspect of the song, such as percussion, synth, bass, or vocals, and contains a sequence of notes.

Amplitude offers four different modes of play: single player game, remix, multiplayer and online.

[4] There are 26 songs in Amplitude, the majority of which are tracks by popular music artists, with genres ranging from electronica and dance to hip hop and alternative rock.

Kasson Crooker, who served as the musical director for the game, contributed the songs "Cool Baby", "Synthesized", "Robot Rockerz" and "Spaztik", as well as "Super Sprøde" as performed by his band Freezepop.

[6] The flatter track enabled players to have a better concept of where they were on the instrument spread, though the decision was criticized by fans of FreQuency.

The second factor they considered was that both Frequency and Amplitude, published at a time where most video game coverage was based on print media, did not come off clearly in static screenshots.

"[23][b] Amplitude sold more units than its predecessor, Frequency, but it wasn't considered a financial success for Harmonix.