Puzzles
I love puzzles. Finished 1000 Colours in 3 days because I couldn't stop. I'd come home from work and spend the rest of the evening puzzling away. There was something really pleasant and satisfying in piecing together a puzzle with no imagery. It was actually a little easier than you'd think but since the gradient wasn't always a smooth transition, there were definitely areas that were challenging. Sometimes you just need one piece to fit to make yourself feel better. Until you realize at the end that it's just one piece that is missing.