Sums and Differences - A game to develop arithmetic skills in KS2 and KS3

This was a starter activity for Year 7 originally but I ended up using it for many KS3 class.
You are provided with a ‘Blockbuster’ board and 6 double digit numbers.
Each cell on the board can be won by finding the two numbers that add or subtract to give the number contained within that cell.
One player/team is trying to create a path from top to bottom while the other player/team are attempting to create a path from right to left.
The winner is the player/team to complete their path (a draw is impossible).
Start with the toss of a coin and then teams take alternating goes - spice it up by adding a timer !