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WSRF XV Shape Academy
✕ XV Marks
X marks (red) = adjacent pair sums to 10. V marks (yellow) = adjacent pair sums to 5. On medium+ difficulty, negative XV is active: no mark between neighbors means their sum is NOT 5 or 10.
◐ XV Ghost Signal Mode
Cage combo convergence + XV marks constrain combos further. XV marks on cage cells fire combo convergence faster and more decisively.
≡ XV Beam Scan Mode
Small cages create pointing geometry. XV marks on aligned cage cells create "charged beams" for stronger eliminations.
◇ XV Psychic Resonance Mode
45-rule innies + XV equations: innie + neighbor = 5/10 narrows forced values further.
⟶ XV Force Vision Mode
When direct logic stalls, try a candidate and propagate. If it creates a contradiction (cage sum broken, XV mark violated, 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
- XV Bg toggle in theme bar to show/hide mark backgrounds