Collection of many single-player open-source logic puzzle games, free, playable offline.
All generated on demand with adjustable size/difficulty, so you'll never run out of puzzles.

Contains the following games:
Black Box, Bridges, Cube, Dominosa, Fifteen, Filling, Flip, Galaxies, Guess, Inertia, Keen, Light Up, Loopy, Magnets, Map, Mines (Minesweeper), Net, Netslide, Pattern, Pearl, Pegs (Solitaire), Range, Rectangles, Same Game, Signpost, Singles, Sixteen, Slant, Solo (Sudoku), Tents, Towers, Twiddle, Undead, Unequal, Unruly, Untangle

Original copyright Simon Tatham
Port copyright ChrisbBoyle.
Distributed under the MIT License (www.chiark.greenend.org.uk/~sgtatham/puzzles/doc/licence.html#license)