Looking for a new challenge in number puzzles? Try Adder's Coil created by Wylie - Master Puzzle Maker.
Adder's Coil is easy to learn. Make a single path through all squares of the puzzle grid formed by the numbers 1 to 9 in order, repeated as many times as necessary. After 9 is reached, begin again at 1.
The correct path - the Adder's Coil - forms a continuous loop that does not cross itself, split or reach a dead-end at any point.
The puzzle comes at four levels of difficulty - easy, medium and hard, plus master class for the real experts.
This paid app has 360 intriguing puzzles for you to enjoy. To make sure it is right for you, first check out the free version - Adder's Coil Free (with 45 sample puzzles)- from the Android Market.