The same basic mechanism can hide a different recognition task: seven groups of shape and surface modifications, each with an original teaching illustration.
In this guide
Mirror Cube
Different heights and widths identify pieces instead of colours. Build a flat first layer, complete the middle and apply 3×3 last-layer logic. Shape replaces colour recognition.
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Geometrically calculated 3D teaching view. Mirror: unequal piece widths and heights, with matching cuts across shared body edges.
Further reading: J. A. Storer: Mirror Cube
Picture cubes and supercubes
Pictures and arrows reveal centre orientation. Solve the pieces, then the motifs.
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Geometrically calculated 3D teaching view. Picture/supercube: every arrow lies in its actual face plane.
Further reading: Jaap Scherphuis: Rubik’s Cube Variants
Fisher Cube
The altered cut changes how 3×3 pieces look. Identify actual centres, edges and corners from their movements, then solve layers and attend to visible centre orientations.
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Geometrically calculated 3D teaching view. Fisher: calculated solid with spatial cut lines; simplified teaching model.
Further reading: Smithsonian: Fisher Cube, collection object
Axis Cube and Windmill Cube
Oblique cuts disguise piece types. Track a piece through a turn instead of classifying it only by visible colours. Plan: identify axes → build shape blocks → solve the underlying 3×3 structure → check orientation.
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Geometrically calculated 3D teaching view. Axis: calculated solid with spatial cut lines; simplified teaching model.
Further reading: Rob Stegmann: original puzzle collection and observations
Pyramorphix and Mastermorphix
A pyramid shape does not identify the mechanism: Pyramorphix modifies a 2×2, Mastermorphix a 3×3. Identify the underlying corners or edges before transferring the corresponding cube method. Neither is a Pyraminx.
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Geometrically calculated 3D teaching view. Mastermorphix principle: tetrahedral shell with orthogonal cube cuts; schematic teaching model.
Further reading: Jaap Scherphuis: Rubik’s Cube Variants
Void Cube
Missing visible centre tiles remove familiar colour references. Establish the scheme from neighbouring edges and corners. An apparent two-edge swap can reflect an incorrect assumed centre system; check your imaginary face assignments first.
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Geometrically calculated 3D teaching view. Void: open face centres with visible inner tunnel walls.
Further reading: Jaap Scherphuis: Rubik’s Cube Variants
Barrels, eggs, hearts and spheres
Barrels, eggs and hearts can modify a 3×3. Layer solving remains useful; identical pieces and visible orientations complicate recognition. Other spherical mechanisms need different methods.
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Geometrically calculated 3D teaching view. Barrel: octagonal solid with consistently calculated layer and piece cuts.
Further reading: Jaap Scherphuis: Rubik’s Cube Variants