The game : 13

Introduction "13: the game", is simply one of the most simple and fun puzzle games in the world. To play you just have to click on one of the boxes on the board, and all the adjacent similar boxes will merge with it to form the same +1 digit. Your goal is to create a box with the number 13. It's super easy at first, but only 0.3% of players are able to reach a box with the number 13 ... Are you ready for the challenge?