Microsoft Jigsaw is a free jigsaw puzzle app for Windows tablets ... which makes solving a puzzle more of a race against the clock than a slow-paced activity, and its Xbox network connectivity.

You can now play a range of puzzles on our site, from sudoku to crosswords, every weekday. The puzzles will update every weekday at midnight so make sure you bookmark the links to play.

You can now play a range of puzzles on our site, from sudoku to crosswords, every weekday. The puzzles will update every weekday at midnight so make sure you bookmark the links to play.

Math riddles and puzzles come in plenty of different varieties. Some more straightforward number puzzles require calculations ...