Love it. In order of difficulty for me...
Math puzzle: Take me some time to identify the numbers in this font (don't know why)
Word puzzle: I keep moving my mouse like it was a QWERTY keyboard
Color puzzle: I don't know the mix of some colors so I have to guess some times
Temperature puzzle: Ok
Maze puzzle: Ok
Green puzzle: Easy
Pink puzzle: Easiest of them all (click in all vertices, them center)