Synth Riders is a very graphically impressive hand waving simulator. I enjoyed the visual presentation of the stages, but the gameplay requires a lot of extrinsic dancing to feel fun. There's a lot of music available, but most of it is exceedingly repetitive and about 10% too long. Very few of the tracks felt like they utilized the mechanisms appropriately in any given mode. This is just barely a rhythm game, but may be appealing as a kind of soundscape sandbox for dancers.