DD is 7, and enjoys having a bit of downtime with her tablet, but the apps she used to use (e.g. the Cbeebies ones) now seem a bit young for her. She hasn't tried Minecraft/Roblox etc and I'm not really into gaming, so I'm not sure where to start. I'd like to find a few things she can do that will hold her interest, bonus points if it's maths-based as she really enjoys maths, but not something that's going to be really addictive or where she can rack up the spends. What are some good, creative games for kids that don't cost a fortune?