The Mind Bender
Let the soothing oriental soundtrack whisk your worries away as you navigate your way through each level using the arrow keys. Using mouse-over-matter techniques, you may drag the wooden boxes to places that help you get over obstacles or keep you from landing on the dangerous spikes. Just click the box to form a telekinetic tether and drag it where you need it to be. While it is being transported, the box will blow an electric blue, and you'll be able to pass right through it if you wish, but it turns solid again once it comes to rest (unless you're in the way).
Besides spikes and boxes, the only other special block type is a glowing green barrier. You can pass through it, but blocks may not. There are no moving blocks or platforms, no keys to collect, no coins to seek out, just you and some boxes. This necessarily limits the variety of levels, but The Mind Bender does a good job of exploring the possibilities nonetheless. It also makes the mouse/keyboard duality of controls bearable, since at no time are you under any pressure to use both in rapid succession.
It's OK to zone out while playing The Mind Bender — it's really not that taxing on your brain or your fingers, nor is it trivially easy. Instead, it hits the sweet spot in between, in the realm where it's possible to put yourself halfway onto autopilot while you decompress. Think somewhere in between Solitaire and Ball Revamped.
Or just play it for fun. That always works, too.