I'm brainstorming a game aimed for touchscreen. Its primary interaction involves a lot of rubbing and scratching with the finger to the on screen objects, sort of like Fruit Ninja, but a bit more work than a single swipe. I recall there are somewhat similar operation in Rayman Raving Rabbid that uses Wiimote to draw shapes.
At this stage, the interactions in my mind looks repetitive and unappealing. I'm trying to find similar examples that appear repetitive but still fun to play. Besides these two, are there any others?