Sometimes you just want to switch your brain off on a Friday afternoon. You need Music Catch 2.
Shapes appear on screen in sync with the piano-led soundtrack. Collect them by moving your mouse over them. Yellow adds to your multiplier, red subtracts, while pink (or purple) is a power boost. There's nothing particularly challenging, but the result is hypnotic and meditative. Give it a try.
Music Catch 2 [Reflexive]