Pass a pleasant evening with a JIGSAW from the National Geographic Magazine
Most of the puzzles here can be done in about 10 minutes (it tells you how you long you have taken) but you can make them a lot harder by making the pieces smaller and having to turn them around to fit. If you do the puzzles just as they come up without changing the difficulty, then the pieces are all the right way round, you just click and drag. There are a lot of different pictures to choose from and also other types of puzzles too. The slide puzzle is another good one but you need quite a lot of patience!
Puzzles, Word Games & Crosswords similar to the popular Puzzler Magazine
Recommended by the Saga Web Site as their Puzzle Section was not available when I last checked!