Solution level 20, take the knife was on the floor by way of touch, then cut the vines at the plant gate 20. The code was revealed that shows you how many times to tap the badges to the sides: tap bottom left one 1 time, tap the top right one 3 times, tap the bottom right one twice.
Once you have completed the above explanation, the gate 20 will be out smoke blue, red, yellow, and green. Now press and hold a few seconds the sword to complete the level 20 and the door will open.
Now continue to the 100 gates level 20 solution, or back to the 100 gates level 19 solution