Here are two more pages, with collections of free portable puzzles and maze games.
They are portable because they use JavaScript and/or Java:
Simon Tatham's Puzzles: https://www.chiark.greenend.org.uk/~sgtatham/puzzles/ standalone programs
http://www.logicmazes.com/ Run in the bowser. I assume (
) they work, but since Java is not cooperating well with my browser ... I don't know!