Now you need to find the right order for bringing the horizontal sliders into an unlocked position. The principle is the following: when you unlock the first horizontal slider — the vertical slider should still be able to move freely in 3 positions. When you unlock the second horizontal slider — the vertical slider should still be able to move freely in 2 positions. Etc. If shifting the first horizontal slider “locks” the vertical slider — this was not the right slider to start with