How the Online 3x3 Cube Solver Works and How to Use It

Updated

To solve your scrambled cube on onlinecube.com, copy each sticker color from your physical cube onto the flat net in the solver section, then press Solve. The site returns a solution in about twenty moves, calculated in your own browser with the Kociemba two-phase algorithm. You can then step through those moves one at a time while the 3D cube on screen turns along with you. This works for any 3x3 speedcube, and you don't need to hold your cube in a particular orientation.

Entering your cube correctly

The solver reads the six center stickers as the names of the faces, so you paint the net exactly as you see your cube — no reorientation needed.

  1. Pick a face to start with. Any face works. Use its center sticker color as the reference for that side of the net.
  2. Fill in the eight surrounding stickers for that face, matching what you see on your cube.
  3. Repeat for the remaining five faces, always keying each face off its own center sticker.
  4. Press Solve.

Expected result: a move sequence of roughly twenty turns. Because the centers anchor each face, a cube held "sideways" or upside down still solves correctly — the solver works out the rest from the centers.

If your pattern is impossible

If the colors you entered could never exist on a real cube — for example, a corner with two stickers of the same color — the solver will not return a solution. Instead it tells you which piece looks wrong. Recheck that piece against your physical cube and correct the net. This guard means you never get handed a sequence that cannot work.

Stepping through the solution

Once the solution appears, you can advance one move at a time. The 3D cube turns in sync with each step, so you can follow along on your real cube and confirm each turn before moving on. This is the main reason to use the solver as a learning aid rather than just a answer machine: you see how each move changes the cube.

Related tools on the same page

The solver sits alongside three other features that share the same 3D cube:

Tool What it does How to use it
Simulator A real 3D cube you can turn by dragging stickers or pressing keys Drag a sticker and the layer follows; it snaps square past a third of a turn. Drag the background to spin the whole cube. Keys U, L, F, R, B, D turn faces; hold Shift for counterclockwise. Scramble and full-screen buttons are provided.
Timer Speedcube timer with scrambles and averages Hold the space bar and release to start; press again to stop. On a phone, tap the clock. Each solve gets a fresh 20-move scramble. Tracks best time, average, and averages of 5 and 12. Inspection can be turned on for the WCA's 15 seconds. Times are saved in your browser.
Tutorial Seven-step layer-by-layer beginner method Build the white cross, finish the white face, fill the middle layer, make the yellow cross, then order the last layer. A handful of short sequences; most people get through it in a weekend.

Why about twenty moves is enough

A 3x3 has 20 moving pieces that can be arranged in 43,252,003,274,489,856,000 different ways. Despite that, any arrangement can be solved in 20 turns or fewer — a limit called God's Number, proved by researchers only in 2010. The solver's roughly twenty-move answers sit right at that ceiling, which is why the output stays short even for heavily scrambled cubes.

Practical tips

  • Use the simulator to practice the returned moves before applying them to your physical cube, especially if you're new to notation.
  • Keep the timer's inspection off until you're comfortable with the layer-by-layer method; the 15-second WCA countdown adds pressure you don't need while learning.
  • Trust the impossible-pattern warning. If the solver flags a piece, the error is almost always a misread sticker on the net, not a broken cube.