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.
Rail
Eg En
Color
Flapp
Mini
Hallo
Algeb
Dot T
Parro
Monst
Dart
Moana
Gensh
Samur
Comba
Baby
Merma
Kobad
Off T
Run S
Cooki
Big L
Real
Barbi
Polic
Hex P
Lana
Canno
Blond
10x10
Brain
Furio
Tic T