Buy the author a flat white ☕
…and get 50 of the hardest, most elegant Spheromino puzzles in return — the ones that never touch the free library.
What's inside
- 50 hand-picked puzzles — 25 Genius + 25 Advanced
- Every puzzle verified to have a single, unique solution
- Print-ready and colourblind-safe — a letter on every segment
- Full answer key at the back
- Pay once, instant PDF, yours forever — no account
A peek at three Genius puzzles — the PDF has all 50.