Lost in the middle of an algorithm
Everyone does it: one wrong turn and the layers you'd finished are scrambled.
If you know where you stopped
Undo the moves you've done, in reverse order and each one reversed (R becomes R', U' becomes U). Then start the algorithm again.
R U R' U R U2 R' R U2 R' U' R U' R'
If you don't
- First layer still intact? Start again from the step you were on. Only the layers above it are affected.
- Everything messed up? Scan the cube with ScanMyCube and follow the solution move by move. It shows each turn on the 3D cube.
Common mistakes
- Guessing at a fix. Random turns usually make it worse. Undo, restart the step, or scan.