These are pretty basic to advanced brain puzzles, but there's a few gems in there. Magnets is a lot of fun. Net, Signposts and Tracks are clever puzzles. There was one other one in there I used to enjoy but I can't recall which one it was (maybe Pattern?).

They're all about on-par with the level of exciting-ness of Minesweeper and Sudoku. Take that as you wish.