Flash Flash Revolution (a.k.a. FFR) is an Adobe Flash-based Dance Dance Revolution simulator (hence the name) that uses players' fingers rather than their feet. The game is mirrored by four hosts, thus being playable even when the main website is having issues.
The game has been developed for several years and now has several clone variations, FFR R2 and SpinItUp!, also developed by Synthetic Light Studios.
Currently the game is at version .712, although not so much a beta as a non-perfect clone of DDR emulators like StepMania, with many features still in the works (see the in game settings menu for future features — dimmed out and non-interactable).
One of the most unique features of this rhythm game is its multiplayer features, since it was probably one, if not the, first to do so.