Portable Puzzles
The Portable Puzzle Collection is exactly what the name suggests. But what makes it portable? The games are so small and light, you can keep them on a USB key so as to have them with you at all times.
There really are quite a few games here with puzzles of every kind. The pack includes mathematical and numerical puzzles (including Sodoku and the 15 game), Tetris, Minefield, Mastermind and many others, sure to guarantee hours of fun.
Keep an eye on the official site where new puzzles will be released for free over time. You can download indiviual games or a Zip file that holds them all. There's no need for installation and they can be played straight off your USB key.
An oldie but a goodie!
Tetris
It's been around forever but it's popularity has not waned a bit. Here are many variations on the same theme!
Too hard for you?
2H4U
This original puzzle game combines Tetris and Arkanoid. Think you can play both at the same time?