In The Groove is an arcade dance game like DDR (Dance Dance Revolution). Two "pads" with four directional panels per pad are facing a screen, on which arrows will scroll from bottom to top, each arrow coresponding to a direction on the pad. When the arrow reaches the top of the screen, the player is required to step on the appropriate panel. Accuracy of the players timing is shown on each step.
ITG is produced by Roxor. There plan was to take the concept of DDR and make it better. DDR and ITG differ in many places. For example ITG has a three-dementional graphics system as opposed to DDR's two.
The first issue between Roxor and Bemani started over Roxor taking DDR cabinets and modifying them to play ITG instead of producing their own. That started a lawsuit that is still being battled in court.
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