LEVEL 9
3D Medusa
Coloring a network of conjugate candidates exposes multi-digit contradictions.
How to find it
- Build a network from bivalue cells and strong links.
- Assign alternating colors to connected candidates.
- Resolve a same-color contradiction or eliminate candidates seeing both colors.
Candidate-map demonstration
The violet cells mark the pattern and the gold cell marks the resulting placement or elimination. Treat this compact map as orientation; use the verified full puzzle below to practise the actual deduction.
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Common mistakes
- Using cells that do not share the required row, column, box or peer relationship.
- Removing a candidate before confirming every occurrence in the pattern.
- Confusing a possible pattern with a completed logical proof.
VERIFIED PRACTICE
3D Medusa training
Loading a mathematically verified puzzle state…