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.
Aa To
Block
Farm
Pizza
Wall
Miss
Tap C
Tom's
Alien
Afric
My Sl
Motor
Physi
True
Hallo
Wonde
Cube
Tower
Ants:
Dig W
Stick
Chris
Perfe
Ferra
High
Copte
Room
Who W
Oscar
Candy
Senio
Happy
Bank