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Turn the layers until every side is one colour.
Drag a coloured face along a row to turn that layer. Drag anywhere else to look around; you can't solve it without seeing the back.
The pieces: there are no corners. Each side has one centre and four edges, and an edge carries two colours. Moving a middle layer moves centres too, so a centre doesn't fix a side's colour.
Keys: R L U D F B M E S turn a layer, with Shift to reverse. Z undoes, H hints, N starts a new game, arrow keys look around. Letters name the layers from the starting view.