DanceDanceRevolution NX is a solo play StepMania and Outfox theme based off the excellent DDR A theme released by MadkaT, Risk, pkwp, and KENp.
DDR NX also includes a new 3D noteskin based on Peters-DDR's Vivid DDR noteskin. Simply extract "DDRNX-Noteskin.rar" to "OutFox/Appearance/NoteSkins/dance/".