RubiksSolverDemo

Online solver for Rubik's cube cross, xcross, free pair, last layer. Pseudo F2L solver and EOCross solver also available. Visual cube‑state editor is also available.

Solver URL
Old version

Trainers

• Cross trainer
• XCross trainer
• Free Pair trainer
• Pseudo XCross trainer
• Pseudo Free Pair trainer
• EOCross trainer

Solver Overview

This is an online solver for speedcubers that uses specific methods such as CFOP and ZZ. It is designed to perform solution searches for techniques like cross, XCross, and EOCross. Additionally, it supports the search for some algorithms for the last layer.

Basic Functions and Notes

• The following 13 solvers are currently available:
  • F2L Lite: Lite solver for cross, XCross, XXCross, XXXCross, and XXXXCross. Analyzer available.
  • Pairing: Lite solver for a free pair. Analyzer available.
  • Pseudo F2L Lite: Lite solver for pseudo cross, XCross, XXCross, and XXXCross. Analyzer available.
  • Pseudo Pairing: Lite solver for a pseudo free pair. Analyzer available.
  • EOCross: Lite solver for EOCross, XEOCross, XXEOCross, XXXEOCross, and XXXXEOCross. Analyzer available.
  • LL Substeps Lite: Lite solver for last layer CP, CO, EP, and EO
  • LL Lite: Lite solver for last layer
  • LL AUF Lite: Lite solver for last layer and AUF
  • Two Phase: Two Phase solver using min2phase.js
  • F2L: Solver for cross, XCross, XXCross, XXXCross, and XXXXCross. Recommended for use with PC. Analyzer available.
  • LL Substeps: Solver for last layer CP, CO, EP, and EO. Recommended for use with PC.
  • LL: Solver for last layer. Recommended for use with PC.
  • LL AUF: Solver for last layer and AUF. Recommended for use with PC.
• The last four solvers can search much faster than their corresponding lite solver, but they require more memory and take longer to set up.
• Some solvers come with an analyzer that solves for each pattern one at a time and displays the shortest number of moves in HTM in a table. The numbered cells in this table act as buttons to start the search with that condition. You can click the header to sort the table by its columns. Also, you can select the faces to analyze from U, D, L, R, F, and B.

Memory Requirements Table

Solver	Single Search	Analyzer
F2L Lite	50 MB	50 MB
Pairing	50 MB	100 MB
Pseudo F2L Lite	50 MB	50 MB
Pseudo Pairing	50 MB	200 MB
EOCross	100 MB	100 MB
LL Substeps Lite	50 MB	-
LL Lite	50 MB	-
LL AUF Lite	50 MB	-
F2L	800 MB	50 MB
LL Substeps	800 MB	-
LL	800 MB	-
LL AUF	800 MB	-

Usage and Features

• Scramble history navigation with [⬅️] and [➡️] buttons.
• [Reverse] button reverses the alg of each row.
• [Mirror] button mirrors the alg of each row.
• [Random] button generates a random scramble using min2phase.js.
• [Start] button begins the search; [End] stops it.
• Solutions are shown in real time, with Twisty Player and links.
• Query parameters update automatically with input changes.
• Functions exported by Emscripten may require manual reload if not initialized.

Input Description

• Cube Editor: Visual cube-state editor. In Swap mode, you can swap two pieces by clicking them; their orientations will be rotated so the selected stickers exchange positions. In Flip mode, clicking a piece will rotate its orientation. The Get Scramble button generates a scramble for the shown state (rotations are not included; edit if needed). If the state is unsolvable, an alert will be shown.
• Scramble: Describes the state of a Rubik's Cube using standard notations. You can add comments using //. The following notations are available:
  
  • The following Rubik's Cube notations are available:
    • Face Turns:
      • U U2 U2' U'
      • D D2 D2' D'
      • L L2 L2' L'
      • R R2 R2' R'
      • F F2 F2' F'
      • B B2 B2' B'
    • Wide Moves:
      • u u2 u2' u' Uw Uw2 Uw2' Uw'
      • d d2 d2' d' Dw Dw2 Dw2' Dw'
      • l l2 l2' l' Lw Lw2 Lw2' Lw'
      • r r2 r2' r' Rw Rw2 Rw2' Rw'
      • f f2 f2' f' Fw Fw2 Fw2' Fw'
      • b b2 b2' b' Bw Bw2 Bw2' Bw'
    • Slice Moves:
      • M M2 M2' M'
      • E E2 E2' E'
      • S S2 S2' S'
    • Rotations:
      • x x2 x2' x'
      • y y2 y2' y'
      • z z2 z2' z'
  Comments can be written using "//". It is recommended to place "// setup" comments on the appropriate line. When viewing on alg.cubing.net or cubedb.net, the line with "// setup" and above will be included in the Setup or Scramble section, while the lines below will be included in the Moves section.
• Rotation: Select a rotation alg before starting the search.
• Slot: Select F2L slots (BL, BR, FR, FL) or None for cross solver.
• Free Pair: Select a slot for solving the free pair.
• Pseudo Slot Edge/Corner: Select pseudo slots for pseudo cross/slotting.
• Last Layer Option: CP, CO, EP, EO, or None for XXXXCross solver.
• Max Length/Count: Set max moves and solutions.
• Move restrict: Restricts the moves used in the search. For example, if U, R, F is selected, only U, U2, U', R, R2, R', F, F2, F' are allowed. Advanced settings allow more detailed configuration. If you select rotations (x, y, z), set Center Restrict and Max Rotation Count in the Advanced Settings.

Advanced Settings

• Pre Move: A preliminary algorithm executed before search. This enables the search to solutions beginning with the algorithm set here. If you set algorithms here that rotate the center, such as wide, slice, or rotation, you must also configure Center Restrict accordingly.
• Move Available Table: A table of checkboxes that lets you decide whether a particular ordering of moves—e.g., allowing the order A→B—is permitted in the solution. The rows represent preceding rotations, and the columns represent subsequent rotations. The bottom row (A=empty) corresponds to the first move setting. This table is normally generated automatically based on the configured Move Restrict. If you would like to set custom rules (such as requiring the first move to be a rotation), you must configure this table appropriately.
• Center Restrict: Center rotation settings. By default only Empty-Empty is checked, which means the center must return to the initial state—the state of the center after the user-defined Scramble and Rotation.
• Max Rotation Count: The maximum number of times rotations (x, y, z) are used, excluding user-defined Rotation and Pre Move. The default value is 0. If rotations (x, y, z) are permitted in Move Restrict, this must be set to 1 or higher.
• Max Move Count: A table of maximum move counts allowed by the Move Restrict. Note that the algorithm specified in Pre Move is not counted.

Solver Descriptions and Examples

F2L Lite

• Yellow cross. Example
• White cross (Rotation selected). Example
• White cross (Rotation in Scramble). Example
• White XCross. Example
• 1st F2L (Move Restrict: URF). Example
• White XXCross. Example
• White XXXCross. Example
• White XXXXCross (F2L skip). Example
• Last two F2L slots (Move Restrict: URF). Example

Pairing

• Cross with a free pair. Example
• 3rd F2L and last pair, setting Move Restrict to URF. Example

Pseudo F2L Lite

• Pseudo XCross. Example
• Adjecent pseudo XXCross. Example
• Diagonal pseudo XXCross. Example

Pseudo Pairing

• Pseudo cross with a pseudo free pair. Example
• 3rd pseudo slot and last pseudo pair, setting Move Restrict to UDR. Example

EOCross

• EOCross (LR). Example
• EOCross (FB). Example
• XEOCross (LR). Example
• XXEOCross (FB). Example

LL Substeps Lite

• OLL, setting Move Restrict to URF. Example
• ZBLS, setting Move Restrict to URF. Example
• COLL, setting Move Restrict to URF. Example

LL Lite

• PLL, setting Move Restrict to URF. Example
• 2GLL, setting Move Restrict to UR. Example
• PLL-Aa, setting Move Restrict to UDR and Pre Move to x. Example
• PLL-Na, setting Move Restrict to UDRz, using the custom Move Available table. Example

LL AUF Lite

• Last layer and AUF. Recommended to use LL Lite or LL solver.

Trainers Overview

Random pattern generator based on min2phase.js and a full pruning table. Six trainers are available. Scrambles can be generated with parameters, and solutions can be checked instantly.

• Cross trainer
• XCross trainer
• Free Pair trainer
• Pseudo XCross trainer
• Pseudo Free Pair trainer
• EOCross trainer

Each trainer comes with a corresponding solver. [Next] generates the next scramble, and [Solve] checks the solution.

Pattern Statistics

Cross

HTM	Number of Patterns	Percentage
0	1	0.00
1	15	0.01
2	158	0.08
3	1394	0.73
4	9809	5.16
5	46381	24.40
6	97254	51.16
7	34966	18.40
8	102	0.05

XCross

HTM	Number of Patterns	Percentage
0	1	0.00
1	15	0.00
2	172	0.00
3	1950	0.00
4	21535	0.03
5	220368	0.30
6	1989591	2.73
7	13431990	18.40
8	40963892	56.12
9	16325184	22.37
10	36022	0.05

Free Pair

HTM	Number of Patterns	Percentage
0	17	0.00
1	255	0.00
2	3102	0.00
3	35217	0.05
4	367070	0.50
5	3184390	4.36
6	18621816	25.51
7	41028188	56.21
8	9746797	13.35
9	3868	0.01

Pseudo XCross

HTM	Number of Patterns	Percentage
0	4	0.00
1	48	0.00
2	568	0.00
3	6556	0.01
4	70495	0.10
5	693185	0.95
6	5618257	7.70
7	27845257	38.15
8	36570024	50.10
9	2186315	3.00
10	11	0.00

Pseudo Free Pair

HTM	Number of Patterns	Percentage
0	68	0.00
1	816	0.00
2	9256	0.01
3	103681	0.14
4	1012687	1.39
5	7689281	10.53
6	32089788	43.96
7	30868369	42.29
8	1216774	1.67

EOCross

HTM	Number of Patterns	Percentage
0	1	0.00
1	15	0.00
2	178	0.00
3	1982	0.01
4	21041	0.09
5	204732	0.84
6	1645039	6.76
7	8477633	34.84
8	12917628	53.09
9	1061851	4.36
10	140	0.00