Cube RoomCUBE ROOMA white plus sign with mismatched side colors is a common beginner sticking point. Treat it as a problem you can classify instead of immediately applying a corner algorithm. Checking the cross means inspecting both stickers of each white edge.
Case one: white does not face down yet
Find the white edge missing from the bottom cross and identify where its white sticker faces. The piece may be near the correct centers without having the correct orientation. Being close to its target and facing correctly are different. A blue sticker near the blue center does not by itself make the edge solved.
In the lesson, locate the piece in the face map and review your latest move. If you just made a wrong turn, undoing it is usually easier than guessing two or three more moves to reach a reliable state.
Case two: white faces down but the side color is wrong
A white-blue edge can sit between the white and orange centers with white facing down. Its blue sticker still does not match the orange center. The whole piece is misplaced. Name its real destination before choosing a move, instead of calling it an already solved white edge.
Changing the camera angle cannot hide or fix this relationship. The blue sticker must lie on the blue-center side regardless of where you view the cube from.
Case three: the cross has the right order but is rotated
Sometimes the four white edges form the correct cyclic order, but the bottom layer is offset from the side centers. In that case, turn the bottom one step at a time and check whether all four sides align together. If they cannot all match within one complete revolution, it is not just an overall offset: edges may be in the wrong relative positions.
This is a diagnostic check, not a repair algorithm for every cross error. Try one turn, then observe, so you do not accidentally turn past the correct state.
Retry from a state you understand
The continuous lesson offers undo and a return to the current stage's start. The latter reverses only the moves made in that stage, preserving earlier work. Free-practice undo reverses the current round's recorded moves one at a time. “Start a new scramble” is different: it creates another cube state, rather than undoing your mistake.
After restarting, check each edge's white sticker and side color. Confirm all four before inserting corners. Revisit centers, edges and corners if you are unsure where a piece belongs, or read move notation if the history is difficult to interpret.
Now, make it click.
An existing lesson resumes at your current stage. First-time visitors learn the controls before generating the teaching cube. This entry does not reset your cube to the stage discussed in the article.
Open the guided solve →Sources and further reading
Cube Room wrote this guide around its own practice examples. The sources below help verify basic concepts or provide further study; this is not a verbatim translation of their material. Cube Room is not affiliated with these providers.