Puzzles

##Puzzles

• Defectsweeper: find the dislocations hidden in a hexagonal crystal by walking Burgers circuits.
• Fifteen and the Parity Dial: the 15 puzzle with its permutation, parity invariant, and commutators shown live.
• Slide Rule Cabinet: straight, circular, complex, finite-field, and relativistic slide rules to drag and read.
• Stereonet Slide Rule: the SO(3) slide rule, a Wulff net with a turning overlay and a frame-matching challenge.
• Hamilton’s Turns: compose rotations by laying arcs head to tail on a sphere.
• Cross-Ratio Ruler: read true distances off a perspective picture.
• Tropical Slide Rule: watch addition turn into max as the base of a log scale grows.
• Quaternion Cards: a card game in the quaternion group, where left and right differ.
• p-adic Ruler: a branching-tree ruler for p-adic distance.
• Galois Lock: a lock whose moves are the Galois group of x⁴ − 2.
• Planimeter Bench: measure area by tracing, with polar, linear, hatchet, and x–y planimeters and a running error budget.