Maths Guru
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PuzzleAges 5–11Part of Arcade Walk

Str8ts: fill the grid with straights

Str8ts is a Sudoku-like number puzzle with a twist. Black cells split rows and columns into compartments, and each compartment must hold consecutive numbers (a straight) in any order, while no number repeats in any row or column.

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Str8ts

How to play

  1. Fill every white cell with a number. Black cells divide rows and columns into compartments.
  2. Each compartment must contain consecutive numbers in any order. A 1-cell compartment accepts any single number.
  3. No number may appear twice in a row or column, counting all the white cells across the whole line.
  4. A black cell showing a number is a clue: that number cannot appear in the white cells of its row or column.
  5. Fill short compartments first, and use Check sparingly: you only get 3 attempts.

Maths skills it builds

  • Number order and sequences
  • Logical deduction
  • Elimination
  • Consecutive numbers

Why it works

Str8ts keeps children thinking about number order, since a compartment is valid only if its numbers are consecutive, and also about elimination across a whole row or column. Black-cell clues add an extra layer of deduction that rewards careful reading.

Related maths skills

Questions parents ask

What is a straight?

A run of consecutive numbers, such as 3, 4, 5 in any order, inside one compartment.

What sizes are available?

4×4 for Beginner, 6×6 for Explorer and 9×9 for Champion.

How is it different from Sudoku?

Black cells split lines into compartments, and each compartment must be a straight. Numbers still cannot repeat in a row or column.

Can guests play?

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

Str8ts

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