There are 6 BOARDS in this game. You will need 2-6 players, two six-sided dice and 9 counters for each board. You could also play with player pairs which is a good way to be inclusive. It's a fun way to master basic number facts and develop the number concepts that the game encourages.
Each player has the choice to throw one or two dice. If a 5 and a 2 are thrown the player can decide whether to add the numbers (7), or subtract (3). All players cover that number if they have it on their board. The winner is the first player to have all 9 numbers on their board covered. There is a strategy element that appeals to older players as they check out other players' boards. This only adds to the fun.
I find this game particularly good for developing maths language and concepts with the older child in intervention who still needs to consolidate their understanding at this level. In a classroom I would use mixed ability groups ensuring one player had the skill set necessary. Ideally, you could introduce the game in an intervention session, then place it in a Maths Centre for regular play.
When parents want to be involved I demonstrate this game by playing it with them and model the maths language I want them to use. It's very, very effective when this team approach is used and it is played regularly.