I’m not normally a big video-gamer, though I do tend to play games on my iPhone while riding the subway. As I almost always listen to a podcast or audiobook at the same time, I tend to like mindless yet engaging games – something to distract me visually from the sweaty summer riders crowded in around me, as complement to my earbudded audio cocoon.

In the past, Alto’s Adventure has been a favorite, as has Candy Crush, Two Dots, and Twofold.

This past week, however, I discovered Apple 2016 Editor’s Choice Award-winner Chameleon Run, and I’m thoroughly addicted.

The game is an autorunner, with a simple twist: you can change your little running guy’s color from yellow to pink, and you can only run on planks that match your current color. That addition – forcing you to monitor color-switching with your left thumb, while jumping with your right – makes the game far more difficult and interesting than a standard, one-choice autorunner. The levels are also extremely difficult, with multiple variations and paths through each: collect all the marbles, collect all the stars, complete the level without changing color.

Most brilliantly / nefariously, the game also leverages economist Richard Thaler‘s insight about the power of default behavior: when you die (which happens quite a lot), the game automatically restarts the level, without you having to click something to begin again. That small nudge is enough to keep me playing one more try, wait just one more after that, okay seriously just this last one, no seriously after this one I’m putting it down, etc.

If you’re looking for stupid brilliant immersive fun, go download it (for iPhone or Android) yourself.