One trigger finishes the white layer.
Cross done, white facing down. Four white corners remain, and one four-move sequence — the trigger you drilled in the notation lesson — places all of them.
The trigger
R U R' U'
Repeated 1 to 5 times, it inserts a white corner into the slot at the front-right without breaking the cross.
Play on the 3D cube- 1Find a corner with a white sticker in the top layer. Read its other two colors — say white-green-red. Its home is between the green and red centers.
- 2Turn U until that corner floats directly above its home slot, then rotate the whole cube so the slot sits at the front-right.
- 3Repeat R U R' U'. Each round rotates the corner in place; after one, three, or five rounds it clicks in, white facing down. Pause after each round and look.
- 4A white corner stuck in the bottom but in the wrong slot or twisted? One round of the trigger pops it back up to the top layer — then place it properly.
When all four corners are in, the entire white layer is solid and the side faces each show a solid bar across their bottom. That bar is your progress meter for the rest of the solve: if it ever breaks, undo what you just did.
Tip
See it on the cube
The trigger
R U R' U'
Yellow on top, green in front: the case is set up first, then the algorithm plays one move at a time. Drag the cube to look around it.
Try it yourself
Do it on the cube
2 short exercises with this lesson's algorithm. You turn the cube; it checks the result and helps with any wrong turn.
- Drop the white corner into the front-right slot.
- This corner's white sticker faces up. Repeat the trigger until it clicks in.