So, near at the end of the game you can find a catridge with purple forest. It has 3 screens, but the second screen is a bit tricky. You have 3 pathes to choose, but when you choose the wrong path, your solve progression get reset.
Guide to Solve Purple Forest
You have to choose 6 times. So, you can choose left, middle or right – 1,2,3 respectively. To find out if you have chosen the correct path, you can go back: if you was correct – you will return to the top of the screen, otherwise you will return to 1 screen (where the location exit is).
To beat that puzzle you have to choose in that order: 2-3-3-1-3-2.
Last screen has abandoned building.