🧩 MindGrid Memory Challenge

What a visual memory challenge measures

MindGrid measures visual working memory: how much spatial information you can hold accurately for a few seconds, and how well that holds up as the amount grows. Cells light up on a grid, they go dark, and you reproduce them. There is no reasoning step and nothing to work out — the whole task is encoding and recall.

Short memory tasks of this kind turn up in graduate assessment batteries and in game-style screening exercises, usually alongside a reasoning test. They are also the most practical daily drill on this site: a run takes a few minutes, and the encoding habit it builds — turning positions into shapes — is the same habit the Grid Challenge rewards.

The format on Job Tests Portal

Each round highlights a set of cells for a moment, then clears the grid and asks you to click the cells that were lit. The standard run is 10 rounds with a 5-minute timer, and both are configurable from the selectors on this page.

• The first round is a 3x3 grid with three cells to remember.
• One extra cell is added each round as you continue.
• When the cells to remember pass about 40% of the grid, the grid grows by a row and a column and the target count resets to roughly a fifth of the cells.
• Accuracy is tracked across the run, so a mistake costs the round rather than ending it.

Encoding techniques, with worked examples

1. Chunking by shape

On a 3x3 grid, the lit cells are top-left, centre and bottom-right.

Answer: Remember “diagonal”, not three separate positions.

Why: Three coordinates are three things to hold; one diagonal is one thing. Working memory is limited by the number of items, not by how complex each item is, so chunking is the single highest-value technique in this format.

2. Splitting a larger grid

On a 5x5 grid, five cells are lit: three clustered in the top-left area and two along the bottom edge.

Answer: Store two groups: “triangle top-left, pair along the bottom.”

Why: Two chunks are far easier to hold than five coordinates. As the grid grows, split it into regions first and describe what is in each region rather than scanning cell by cell.

3. Using the edges

A lit cell sits two along the top row on a 4x4 grid.

Answer: Anchor it to the corner: “second from the top-left corner.”

Why: Cells near an edge or a corner are quicker to encode and quicker to find again at recall than cells in the middle. Encode the anchored ones first and use them as reference points for the central ones.

A practice method for visual memory

1. Look at the whole grid, not at each cell. Take in the arrangement as a picture. Scanning cell by cell produces a list, and lists are harder to hold than shapes.
2. Name the shape immediately. Diagonal, L, triangle, pair. A name survives a few seconds of blank screen much better than a raw image does.
3. Split into regions once the grid grows. Two or three named groups beat one long list every time.
4. Rehearse once in the gap. Say the names silently in the moment before recall begins.
5. Click the anchored cells first. Corners and edges first, then work inwards from them while the picture is still fresh.
6. Run short sessions often. A few minutes daily builds the encoding habit far more effectively than one long session a week.

Common mistakes and how to avoid them

• Memorising coordinates. Numbers are slow to encode and slow to read back; shapes are not.
• Staring at one cell to be sure of it. That single cell arrives intact and the rest are gone.
• Panicking when the grid grows. The target count resets to a smaller share of the cells at each size increase, so the first round on a new grid is easier than the last round on the previous one.
• Clicking as memories surface. Rehearse the whole picture first, then click in a deliberate order.
• Practising while distracted. This format is unusually sensitive to interruption, so a quiet few minutes beats a longer distracted session.
• Giving up after a bad round. Accuracy is tracked across the run and one weak round does not end it.

Where to go next

• Start the MindGrid memory challenge — 10 rounds by default, on a grid that grows as you go
• Grid Challenge — the same memory skill with reasoning questions in between
• Spatial Intelligence Test — rotations, mirrors and cube nets
• How to prepare for an aptitude test — how to fit short memory drills around the reasoning formats
• Switch Challenge — holding an intermediate state in mind under time pressure
• All cognitive and aptitude tests — browse the full catalogue and pick your next session