This game is called 'double it'. You pick two number cards and one instruction card and move your piece around the snail board according to the answer. I tweaked it slightly to have various forms of the same instruction such as add/plus and minus/take-away/subtract. It aims to build knowledge of basic number facts. My girls are confident calculating these, currently using a range of techniques to get the answer, some 'in their head' and some on fingers etc. I thought this would help them as they don't always link the words with the actions. As I predicted, minus caused some confusion!
I have one 'happy maths' child and one more reluctant maths child and I think I made the spiral a bit too long for the reluctant maths child. The game lasted about 20 minutes and she was unhappy for at least ten minutes of that, but cheered up at the end as she won. A shorter spiral (and better counters that didn't keep falling over!) would make this more successful! Like many areas of home educating, I am constantly making little changes to help things run more smoothly!