Puzzles such as those produced by ThinkFun seem to be doing just fine. Those are a little easier than Rubik's Cube, but IMO this is a good thing - I've known ve

Puzzles such as those produced by ThinkFun seem to be doing just fine. Those are a little easier than Rubik's Cube, but IMO this is a good thing - I've known very few people who were actually able to noodle out the cube from scratch. Speaking for myself, who admittedly isn't the target demographic of your question, I still love physical puzzles, and don't play any other solo games (neither computer nor complex realistic physical games).