There’s enough computing power in our pockets to send man to the moon. And here we are using it to play a game that would work almost as well in the pages of a 19th-century newspaper. Take a look at the best iPhone and iPad apps.
Simplicity can be a virtue, and this economical puzzle game certainly has accessibility in its favour. It’s dimly reminiscent of sudoku, in that you have to place numbers into a partially pre-populated grid, but these must follow sequential paths (hence the name) from coloured high points down to grey zeroes. Slide your finger along a path and the game will input the figures for you – one thing the newspaper couldn’t have managed. It’s a fun mechanic, and rather moreish.
Things get satisfyingly complicated as the grids enlarge, the number of coloured paths multiply and everything starts to overlap. But the difficulty curve is a bit bumpy – a series of easy levels is often followed by an absolute killer, which you can’t skip.
And undoing your work can be a pain: double-tapping a number should unravel the path back to that point, but it’s sometimes unresponsive; and we wish there was a single-touch restart, as seen on the saintly Pangolin. A confirmation box for level restarts? I’m not a baby.
The first two 'worlds' - each containing 20 levels - are free, but these are mostly quite easy. Enough to familiarise you with the mechanic, but not hugely gripping. We think it's well worth shelling out 69p for the next three worlds, which are a bit more challenging, and there's two more level packs after that if you're really addicted.