Online since 2002. The most comprehensive site for all around twisty puzzles.

Square-1 (3 layers)
Marcos Square-1A Square-1 in midturn and afterwards reshaped into a cube.
Marvin (aka Half-Truncated Square-1)A half truncated Square-1.
Mega ChallengerAnother mass produced variant of Square-1

MF8 Square-1MF8s version from 2007. Produced in five different colors.
Micro Square-1A Square-1 with an edge length of only 12 mm.
Mirror 1x2x3 SplitA mirrored (aka: bumped) version of the Split 1x2x3

Mirror Square-1The concepts of Mirror Blocks and Square combined in one puzzle.
Not-So-Square-1Could also be named "Bump Square-1"
Octagon-1A Square-1 truncated into a regular octagonal prism.

Offset Square-1/2 EqualA Square-1/2 puzzle with a symmetric middle cut and layers offset by 45.
OlidiusA puzzle made in the former Soviet Union. Even in that region a very rare item.
Otter CubeA split bandaged 1x2x3 offset similarly to the zock cube.

Pent-1The concept of the Square-1 implemented with a pentagonal prism.
Penta-1A Square-1 in shape of pentagonal prism with a tilted axis system.
Perez' Square-1A fishered and restickered version of Square-1.

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