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Rogo is a clever puzzle game for iPhone that uses the idea of the Nearest Neighbour algorithm to create a plentitude of head-scratching challenges. For each grid, you need to make a loop that uses a set number of squares, while also passing through the greatest number total.

Sounds simple, but it's really not. It's easy to think that the larger numbers on the grid are clearly going to be part of your loop, but then when you look elsewhere, you realise that adding all the smaller numbers up can sometimes equal more. If you manage to find the greatest total available on a level, you'll receive a gold medal.

There are plenty of puzzles included with the $1.99 asking price, although three packs of additional grids are available for $0.99 each. I was content with the included puzzles though. Grab Rogo from the App Store, or grab the free Rogo Lite which includes 36 puzzles.