Drop Flip 9+

I thought I'd give this a quick try this morning (it being Christmas and all...) and found myself fascinated and mesmerized by it very rapidly. Dead simple (at first) it rewards with little jilts of serotonin and dopamine with each successful puzzle. And getting one on the first try makes you feel like a champ!
Just nudge a bit here and there, flip that, move that (and sometimes, things are just simply in the way or can be ignored completely!) and be rewarded with that "bing" of the ball in the bucket!
It's not really Rube Goldberg (more like a marble drop exercise), but it is great practice for physics and eyeballing things (probably like playing pool...).
I can Imagine next steps being different substrates (harder or softer, or with greater or lesser rolling resistance) and objects you can rotate to any angle!

This game is so much fun that I sit down to play for "5 minutes", look up, and (oops!) an hour has flown by. I like that you may solve several puzzles in a row on the 1st or 2nd try and then randomly the next level will take you multiple attempts to solve. The difficulty level fluctuates just enough to keep you challenged without frustrating you, and I actually laugh out loud all the time at how crazily the ball will careen across the screen when I miss the bucket! It looks deceptively easy yet the nuances of the puzzles are so well thought out that you will become obsessed with moving the props a little bit higher, a little bit to the left, or flipping them over, all in an attempt to get that little ball in the bucket and advance to the next level!