If you like Sudoku then try...

Hashiwokakero

Sometimes called Bridges (the name literally means 'build bridges') Hashiwokakero – or Hashi – is another number-grid game from Japan. Unlike sudoku and futoshiki, however, no extra numbers have to be filled in.

Instead you get to draw, joining the numbers (known as islands) with straight bridges – the number itself determines how many bridges can be attached. The objective is to connect all the islands without any bridges crossing or curving, and what you end up with is something that looks like an electrical wiring diagram.

If it all sounds a bit odd, give it a go anyway - you’ll be surprised by how quickly you get hooked.