The best thing I've done in the weekends is going on maths whizz. Because you can earn more credits and you can get better at maths whizz. First when you start you have no credits.
The maths games are like having some question like, + or - or maybe x and more things. Sometimes I reach my target and so I have to do replay. In replay you have to beat you personal best or beat your freinds time. or you can challenge other people in the world.
If you have enough credits you can buy pets. I have two pets in my bedroom. Well I have 871 credits right now. But we nomarly get 10 question or more up to 20. And we even can add buddes.