Here’s another good game. You steer a snowboarder down the slope picking up maths questions as you go. You can choose different topics and speeds. The questions don’t start for a while to give you time to learn the steering. There are 10 questions in each game. You have to hit the snowball with the correct answer and miss the others before the time runs out. Maybe you could set each other challenges by posting in the comments the highest time left to beat on a particular game racing at a particular speed? I’m still working my way up to controlling the snowboarder well enough to manage it at high speed!
There are a wide range of games, e.g. multiplication tables, fractions of numbers, etc… to choose from.