I have been engaged in a frustrating battle with 3D Picross on the DS. It was fun at first, then got tedious, then got incredibly frustrating and then just got even more infuriating from there. The slightest mistake counts against a perfect score on each puzzle, and those mistakes can include accidentally poking the wrong little cube because of a less-than precise stylus.
Now to put the fury into perspective, each puzzle has a time limit as well for a perfect score. The puzzle I just completed had a time limit of FIFTY MINUTES! This means it is entirely possible to work on it for 40 minutes, only to make an accidental error and lose your perfect score unless you start over.
Why am I still playing this game, you ask? I am on the last level and I'll be damned if I don't finish the son of a bitch.