Stepmania is a free downloadable program available for Windows, Mac, and Linx. This video game is very similar to the famous arcade game Dance Dance Revolution or Pump. The game is simple, just hit the right arrows on your keyboard as arrows scroll upwards on the screen. The arrows usually go along with the music playing.
When I first downloaded this game I loved it, I know playing the real thing or using your feet to acctually dance to it is way better, but this can be an extra feature for your computer, you know just for fun. you can get both the program and songs to play for it free. (Note the songs you download are made by users who spend enough time to contribute)
The program is also easy to insteal, incase you don't know how to insteal it, you can follow a step by step instructions on the main website, there is also instructions to download the songs you want
Overall, I would say give this a try and you might like it, for DDR and Pump fans I would definitly recommend it for them.
Main website: http://www.stepmania.com/
Downloadable songs: http://www.flashflashrevolution.com/sims/
If you have any questions or need help, I will do my best to help.The following video is a sample of what the game is like, (yes this is me playing)