Flash Flash Revolution (FFR) was a pet project that began in early October of 2002. The goal was to create an online and effective version of DDR that was unique yet had the same addictive qualities.
In some ways, you could say that Flash Flash Revolution is an educational game. It strengthens hand-eye coordination, Improves understanding of rhythm and music in general and you could even say it improves math skills. All this in an addictive package that only takes about 2-3 minutes of your time per game.
Lets not forget that it costs nothing!