Change

To step from one peg to another, you have to change at least one thing (you can’t go from red, purple or green to yellow or blue.(start: red in corner (if there is not red in a corner then the level isn’t finished or not right), end: green.))

Purples are portals in Level 2 or higher. Level 2 is the 2nd picture, level 3 is the 3rd picture and so on.

(I chose colours randomly.)