Online logic game

Missing Piece: which piece fits?

Also known as: find the missing piece, missing part of the pattern, which piece fits

A pattern of triangles repeats or is mirrored, and one piece is missing. Find the rule and choose the piece that goes in the “?” spot. You can play 10 minutes a day without signing up.

Go to the game ↓
  • 1.5 minutesper round
  • 4 levelsrepeat, mirror, rotation
  • No sign-up10 minutes a day
  • Progress30-day chart
What it trains

Why look for the missing piece

You can’t complete the pattern by guessing: you need to understand how it’s built, whether it repeats, is mirrored or rotates. The wrong options differ by a small detail: one triangle, a reflection or a rotation.

In your account the trainer has the same name: “Missing Piece”. Once you sign up, you see your score, correct answers, mistakes and level.

  • You see the pattern but not the ruleThe rule is stated in the task
  • You mix up mirrored and rotatedOn higher levels that’s the trap
  • You want a logic puzzle without numbersOnly colors and shapes
  • Your child loves jigsaw puzzlesThe first level is a single cell

Pattern finding

Repetition, reflection or rotation.

Spatial thinking

You need to mirror or rotate the piece in your mind.

Attention to detail

A wrong option can differ by just one triangle.

Testing a hypothesis

The right piece has to match the pattern on every side.

Rules

How to play

  1. Start

    Press “Start”. A pattern appears with an empty “?” spot and four options below it.

  2. The rule

    Above the pattern it says how it’s built: it repeats, it’s mirrored, or it repeats with a rotation.

  3. Answer

    Tap the piece that fills the empty spot. On a computer you can pick the options with the keys 1–4.

  4. Level

    Three correct answers in a row move you up a level: first one cell is missing, then a 2×2 square, and then the pattern becomes mirrored and rotated. A mistake moves you down a level.

  5. Score

    A correct answer earns as many points as your current level; a mistake costs one point. After a minute and a half you’ll see your results.

Play online

Missing piece online

Choose the piece that fills the gap in the pattern. Without signing up you get 10 minutes of play a day.

Missing Piece

A piece of the pattern is missing. The pattern repeats, mirrors or rotates: find the rule and pick the piece for the “?” spot.

Free play left today without signing up: 10 min

Method

What the exercise is based on

Missing-piece tasks are common in logic tests. Here the patterns follow one of three rules: repetition, mirror symmetry or a quarter-turn rotation, and the rule always gives exactly one correct answer.

If you like finding patterns, try Patterns. Shape Rotation trains mental rotation on its own.

1×1One cellA repeating 4×4 pattern with one cell missing
2×2A chunk of the patternA 5×5 pattern missing a square of four cells
6×6Mirror and rotationThe pattern is mirrored or rotated, and one of the options is a reflection
Who it’s for

Which ages

Adults

A minute and a half of patterns with no numbers or words.

Kids

Suitable from age 6: for kids there are only repeating patterns, with no mirrors or rotations.

60+

A calm pace: there’s no time limit on each answer, just one timer for the whole round.

Program finder

Get your program in a minute

Answer 4 questions and we’ll put together a daily program of 5 trainers. We’ll email you the full 2-week plan.

Question 1 of 4

Who will be training?

Questions

Frequently asked questions

How do I figure out the pattern’s rule?

It’s written above the pattern: it repeats, it’s mirrored, or it repeats with a rotation. Find the part of the pattern that corresponds to the empty spot.

Why do the options look almost the same?

The wrong pieces differ by one triangle, a reflection or a rotation. It’s hard to tell by eye, so compare them with the pattern.

Can I play with the keyboard?

Yes: the keys 1–4 pick an option from left to right.

Do I need to sign up?

No, you can play 10 minutes a day right away. A free account lets you keep playing, save your results, track your progress and unlock the daily workout.

Does it work on a phone?

Yes, the trainer runs in the browser on phones, tablets and computers. There’s nothing to install.

Save your results and track your progress

Free sign-up: round history, a chart by skill and a daily workout of 5 exercises. No credit card needed.

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