Comment Simon Tatham's Puzzle Pack (Score 3, Informative) 634
http://www.chiark.greenend.org.uk/~sgtatham/puzzles/
'Net' is my favorite puzzle in the set, but there are 27 different puzzle games total including Mastermind, Minesweeper, a number sliding puzzle, and Sudoku.
Available for PC, Mac, Linux, and Palm.