Cube RoomCUBE ROOMThe white cross has two requirements: four white edges surround the white center, and each edge's other color matches its side center. Seeing a plus sign on the white face alone does not prove the stage is finished.
Find the four white edges
Look only for pieces with two colors, one of them white. White corners are not part of the cross. Find the white-blue edge and point to its home between the white and blue centers. Then identify the homes of the white-orange, white-green and white-red edges.
Observe before turning. Naming the four destinations prevents the mistake of putting white wherever it seems to be missing. The teaching orientation keeps white down, so some stickers are hidden; drag the view or open the six-face map to inspect them.
Match the colors before choosing a path
One simple starting case has the white-blue edge above the blue center, with blue facing front and white facing up. With white down and blue front, a front half turn sends it to the front-bottom position with white facing down. This explains how F2 can move an edge from top to bottom; it does not mean every white-blue edge can be solved by F2 immediately.
If the edge is elsewhere, its white sticker faces another direction, or the front layer contains pieces to protect, first consider the path and what it will affect. No fixed four-move sequence can build the cross from every random scramble.
Check each side color
Once the white cross appears complete, look at the four sides. The front-bottom edge's front sticker must match the front center, the right-bottom edge must match the right center, and the same applies to the other two sides. A white cross with mixed-up side colors usually means misplaced pieces; inserting corners will not automatically correct them.
Cube Room's first stage checks both the four bottom white edges and their four side colors. Its selected moves are designed for that teaching start. They let you practice the goal and its checks, rather than supplying a universal white-cross algorithm.
Make practice purposeful
Before each turn in stage one, point to the edge you intend to move. Afterward, see where it went. Ask whether white faces down and whether the other color matches its center. If you can answer only the first question, inspect the side again.
If the cross looks complete but the app will not continue, read white-cross troubleshooting. Move on to white-corner insertion only after the cross passes both checks. Do not carry an unresolved side-color error into the next layer.
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.