Septic TwistFour layers in shapes of heptagons can be turned without jumbling and fudging.
TetragramFour axes and four effective sides with the cutting pattern of a Starminx II.
Tetragram IIThe Tetragram with curvy cuts that make two types of pieces visible and one additional turn.
TraheptrixA doctrinaire puzzle with two axes with 3-fold rotation and heptagonal pieces.
TraoctrixA doctrinaire puzzle with two axes with 3-fold rotation and octagonal pieces.
Trapen-KrystShaped as the Trapentrix but with only one of its turns, the other being an edge turn.
Trapen-Kryst essenceA minimalist biaxe triangular prism with just two turns: One in steps of 120°, one in steps of 180°.
TrapentrixA doctrinaire puzzle with two axes with 3-fold rotation and pentagonal pieces.
Trapentrix EssenceA doctrinaire puzzle with two axes with 3-fold rotation and pentagonal pieces, with deeper-than-origin cuts.
TriQuadA non truncated version of Bygride-3-4 with different cuts.
TridecalisA doctrinaire puzzle with two axes with 3-fold rotation and decagonal pieces.
TrientalisA doctrinaire puzzle with two axes with threefold rotation and heptagonal pieces.
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