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Logical
Hard
LR

Deductive Reasoning

Sudoku with shapes — fill the ?

Sudoku with six shapes. Each shape appears once in every row and once in every column; one cell holds a ?. Deduce the missing shape by elimination and pick it from the palette. Built-in Help and Hint buttons. Pure deduction — the logical thinking area NATS names for Stage 1.

Duration
~6 min
Length
Adaptive set
Difficulty
Hard

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What to expect

  • A 6×6 grid, partly filled, with one ? cell.
  • Six shapes: circle, hexagon, square, star, triangle, cross.
  • A shape palette, plus Help and Hint buttons.

What it measures

  • Deductive reasoning
  • Systematic elimination
  • Accuracy under time

Instructions

  1. 1Each shape appears once per row and once per column.
  2. 2Cross off the shapes already in the ? cell's row and column.
  3. 3The shape left over goes in the ?. Hints reveal shadows but void the leaderboard run.

Tips

  • Work the fullest row or column touching the ?.
  • Tap Help any time for the rules.
Sample question

Deductive Reasoning

Deduction by elimination. Each of six shapes appears exactly once in every row and once in every column — a Sudoku with shapes instead of digits.

One cell holds a ?. Its ROW already contains the circle, hexagon, square and star. Its COLUMN already contains the circle, hexagon, square and triangle. Which shape goes in the ?

Practise the full test
Format: Sudoku-style Latin square · 6×6 · 6-minute run