Just like at level 43 in the 100 floors level 44, there are plants in the door and you have to move the plant from the right to left.
Then you have to change the color 2 doors to 3 colors with the code shown in the walls, roof and ground. Then touch the door to open it to the color
1G = Grey
2W = White
3B = Black
4W = White
Now continue to the 100 floors level 45, or back to the 100 floors level 43