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Free tool
Hold it with white on top and green facing you. Pick a colour, then tap the stickers. The centres are fixed.
48 stickers left to fill.
The solver reads your 54 stickers into the 20 pieces of the cube, checks that a real cube could look like that, and then searches for a short way back to solved using Herbert Kociemba’s two-phase algorithm. The first phase brings the cube into a smaller group of positions that only need half turns on four faces; the second solves it from there. An exact table of distances — 141 million entries — lets it skip almost everything that can’t lead anywhere, so an answer usually arrives in a few hundredths of a second.
It finds a short solution, not always the shortest possible one. That’s the trade that makes it instant; proving a solution is the very shortest can take far longer.
A solver gets you out of a jam. Learning to solve it takes an afternoon: seven steps, one layer at a time.
About 19 on average. It uses Kociemba's two-phase algorithm with an exact distance table, and on random cubes it averages 18.9 moves. The shortest possible solution for a random cube is usually 17 or 18 moves, so it is within a move or two of perfect.
White centre on top, green centre facing you. The net shows the faces as if the cube were unfolded around the green face: white above, yellow below, orange to the left, red to the right and blue at the back.
Some colour layouts can't be reached by turning — a single corner twisted in place, one edge flipped, or two pieces swapped. That usually means a sticker was entered on the wrong square, or the cube was taken apart and put back together wrongly. The message says which kind of piece to check.
Each letter is a face: R right, L left, U up (top), D down (bottom), F front, B back. A letter alone is a clockwise quarter turn as you look at that face, an apostrophe means anticlockwise, and a 2 means turn it twice.
Yes. Cubeduel is free and open source, with no ads and no account needed.