I'm pretty there's some wrong answers here. In the Spatial section, The Navigator is often wrong and doesn't display the correct answer as one of the choices. Please take a look and check the answers, I've come across this fault many times that I'm certain it's there..
I liked it a lot but now ads will pop up in the middle of games. They cover the entire screen. I get slow times because I end up clicking on ads and it's just annoying.
They really put effort in the problems you'll find here. And the support is great.( ...in case you get stuck)
Needs updated Would not run on Android 6
I love this app. If you enjoy math and science puzzles you will become addicted.
Some more puzzles and some corrections