Every time you make the correct pattern, the game becomes difficult. The game starts easily when you have only two or three changes to make. Required changes start to increase as you progress through the game. And the real fun begins when the small grid which you observe starts to rotate.
Idle
Airpl
Kaboo
Mousy
Cool
Touch
Ball
Magne
Impos
Rapun
Plane
Evil
Kinde
Sling
Monst
Cerki
Schoo
Jewel
My Li
Twins
Chris
Forge
Adult
Save
Yello
Woode
Squid
Nezuk
Push'
World
Super
Simpe
Lurid