Sometimes YouTube's algorithm recommends something that isn't a total waste of time. Sometimes. Most of it is crap. Yesterday's recommendation was good, though. It was one of these evenings where you discover a video and fall into a rabbit-hole of puzzle-videos until way too late in the night.

Cracking the Cryptic is not one of these super highly produced channels with a ton of production-budget. It's a guy playing Sudoku in his office using a webcam. With a weird video-overlay. But it is still a fun watch.

The video up there is him solving a Sudoku with only 4 digits. And how he gets the solution is crazy. Definitely a subscription for me. This is just another type of Let's Play, after all.

So, any good Sudoku-apps for iOS out there?