Geometry and dissection
Tangram
Seven simple tans become animals, letters, proofs, and silhouettes through area-preserving rearrangement.
- Math
- Shape transformation, symmetry, area, and convexity.
- Status
- Playable workbench live
Eastern Puzzle ArchivePuzzle gateways
Three classical puzzles, three ways into mathematics.
Start with the playable Tangram workbench, then follow the roadmap toward ring state simulators and sliding-block search.
Binary state and recursion
Nine Linked Rings
A mechanical sequence puzzle where progress depends on legal state changes rather than brute force.
- Math
- Binary-like states, Gray code, recursion, and move counts.
- Status
- Simulator planned
Sliding blocks and search
Huarong Dao
A compact sliding-block system that turns a historical story shape into an algorithmic search problem.
- Math
- State-space graphs, breadth-first search, heuristics, and optimization.
- Status
- Interactive board planned