Monkeymore Sudoku

Simple Coloring

Level 5 · Orange Belt

Prerequisite: ColoringLearn next → X-WingLearn next → Medusa ColoringLearn next → Remote PairsLearn next → X-ChainLearn next → X-Cycles

Overview

Simple Coloring (Singles Chains) uses two colors to track conjugate pairs of a single digit. By alternating colors along chains, contradictions or eliminations can be found.

How It Works

  1. Find conjugate pairs for a digit (exactly 2 occurrences in a unit).
  2. Color one cell, give the opposite color to its conjugate.
  3. Continue coloring along all connected conjugate pairs.
  4. Rule 1 (Color Wrap): Same color twice in a unit - that color is false.
  5. Rule 2 (Color Trap): Uncolored cell sees both colors - eliminate that candidate.

Example

Build a coloring chain for digit 5 by following conjugate pairs.

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Tips & Patterns

  • Start from any conjugate pair and alternate colors systematically.
  • Either all cells of one color are true, or all cells of the other color are true.
  • Color Trap is the most common elimination type.