Not allowing me to use the pro Paid the money for the pro version, but won't allow me to use it. Keeps saying "Error, authentication required. You have to sign into your Google account", even though I am already logged into my account. Fix or refund me. Thank you
Lots of variety and challenge I'm definitely hooked. Can't recommend the free version, ads are distracting. It's well worth the two bucks!
Incredible Easy to use, im hooked. Every day i try to beat my scores.
Totally awesome A great way to donate and I like that everyth is unlocked by default
need fix Please fix dark background. Not usable
- new chapter "Mixed 2"
- performance improvements and finer animations
- more supported display sizes
Composition of numbers, addition, subtraction, multiplication, division, concepts, procedures