Remember at school when you were bored in class and used a sheet of graph paper to draw a set of numbers and then scribble off the matching pairs of numbers or pairs that added up to 10? If you answered yes, then download this app to relive the nostalgia. If you answered no, then carry on reading.

The objective of the game is to remove all the numbers on the board by matching pairs of numbers or pairs that added up to 10 (yeah, I'm repeating myself now).

Valid pairs must be on the same horizontal, vertical or diagonal.

First, tap on the number you want to remove. This will become highlighted in blue. Valid pair candidates will be highlighted on yellow. To remove the pair, tap on one of the candidates.

Can you remove all the pairs from the board? Probably not, it's really difficult, but hopefully you'll have fun doing it.