Maths Guru
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PuzzleAges 5–11Part of Arcade Walk

KenKen: the arithmetic grid puzzle for kids

KenKen is a number puzzle that mixes Sudoku-style logic with real arithmetic. Children fill a grid so that every row and column contains each number exactly once, then make the numbers inside each outlined cage hit its target using the operation shown. Maths Guru offers it in 3×3, 4×4 and 5×5 sizes.

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KenKen

How to play

  1. Fill the grid so every row and every column contains each number exactly once. A 3×3 grid uses 1, 2 and 3.
  2. Each outlined cage has a target number and an operation (+, −, × or ÷). The numbers inside the cage must reach the target using that operation.
  3. Start with single-cell cages, which give you the value directly.
  4. Use − and ÷ cages next, since they have fewer valid pairs, then work out the rest by elimination.
  5. You get 3 Check attempts, so fill the whole grid before checking.

Maths skills it builds

  • Addition, subtraction, multiplication and division
  • Number facts and factors
  • Logical deduction
  • Elimination

Why it works

KenKen makes children use all four operations in a purposeful way, because cage targets only work if they know their number facts and factors. At the same time the row and column rule trains the elimination logic of Sudoku. The 3×3 version is an easy way in, and 5×5 is a real test.

Related maths skills

Questions parents ask

What is KenKen?

A number puzzle where you fill a grid with each number once per row and column, and each cage must reach its target using the given operation.

What sizes are available?

3×3 (numbers 1–3) for Beginner, 4×4 (1–4) for Explorer and 5×5 (1–5) for Champion.

How many Checks do I get?

Three. Fill the whole grid first, then check.

Can guests play?

Yes. Guests can play the Beginner level. Signing up unlocks Explorer and Champion.

KenKen

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