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Knotting strings
Brainstring AdvancedAn improved design and an additional set of strings set this version apart from the original.
Brainstring OriginalTwelve elastic strings are moved around within a transparent cube.
Brainstring packagingA packaging for all three puzzles known as Brainstring.

Tangle SphereA cornerless Cube with six rubber bands connecting opposite edges.
Void String V1A Void Cube with uniform stickers but strings attached to the edges.
Void String V2A follow-up of Void String V1 with non-uniform stickers and colored strings.

Void String V3A follow-up of Void String V1 with the original objective: Disentangle the strings.

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