Gate level 23 currently use a form of stone circles, and to open it you have to move the colored balls corresponding to the picture next to it, if done correctly colored balls will disappear.
The explanation is the correct 100 Gates level 23 and you should do:
Touch and move the ball in this order:
pink, yellow, purple, green, pink, blue, yellow, purple, green, pink, blue, yellow, purple, green, pink, blue, and yellow balls will be lost, and to open the door touch the stone circle.
Now continue to the 100 gates level 24 explanation, or back to the 100 Gates level 22 Explanation