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WSRF Shape Academy
◐ Ghost Signal Mode
Puzzles where Ghost Signal (cage combo convergence) is the primary technique. Medium-large cages with mid-range sums create many valid combinations, then combo filtering narrows cells to certainty.
≡ Beam Scan Mode
Puzzles where Beam Scan (cage-line pointing) dominates. Small cages aligned within rows/columns create pointing geometry that eliminates candidates in shared units.
◇ Psychic Resonance Mode
Puzzles where Psychic Resonance (45 rule) is the star. Cages strictly within units leave "innie" cells whose values are forced by arithmetic: 45 minus inside cage sums.
⟶ Force Vision Mode
When direct logic stalls, try a candidate and propagate. If it creates a contradiction (cage sum broken, zero candidates), the other digit must be correct.
♦ Hole Cards
You're dealt 2 hole digits from different cages at the start — gold-glowing free answers.
★ Controls
- Click cell then 1-9 to place
- N = notes, C = auto-candidates, Z = undo
- H = hint, B = best move, Arrows = navigate
- 10 mistakes for all difficulties