gridChallenge is listed by Aon as a working memory test. This guide separates what is officially published from what is not, and gives you a drill to build the skill.
Aon lists gridChallenge as a Working Memory test that takes 9 minutes and has nine tasks of varying difficulty. It measures how well you can hold something in mind while processing other information. Aon does not publish the on-screen layout or scoring rules for this test, so treat any detailed description from other sites as unconfirmed.
Aon's candidate preparation page lists the test in a table of aptitude and skills tests. The entry is short, which is why the table below is useful: it keeps the confirmed facts visibly apart from the open questions.
| Question | Status as of 12 October 2026 |
|---|---|
| Time limit | 9 minutes (Aon candidate page). |
| Number of tasks | Nine, of varying difficulty (Aon candidate page). |
| Skill measured | Holding something in mind while processing other information (Aon candidate page). |
| Exact screen layout and stimulus | Not publicly confirmed by Aon. |
| Whether each task has its own clock | Not publicly confirmed. |
| Pass mark or benchmark | Not publicly confirmed. Employers set their own use of results. |
| Official practice PDF | None listed for this test on the candidate page. |
One more detail needs care. A separate Aon blog post describes a gamified working memory assessment (named G.A.M.E. there) as a 12-minute experience. That is a different page written for a different purpose, so a configuration or version difference is possible. If your invitation shows another time limit, the invitation wins.
The names are close and candidates swap them all the time. gapChallenge is the deductive test where you fill a shape grid using the rule that no shape repeats in a row or column; Aon lists it under logic tests with a 6-minute limit. gridChallenge sits in a different category, working memory, and rewards a different skill.
If the puzzle you are preparing for involves deducing a missing shape, read our gapChallenge guide instead. If it is about remembering something while doing other work, you are in the right place.
Working memory is the mental scratch pad. It is what you use when someone gives you a phone number and then asks you a question before you have written it down. A task that measures it needs two things at once: something to hold, and something else to do while holding it.
That is why raw intelligence is only part of the picture. A person can reason well on paper yet lose a detail when an interruption lands. The test is built around that moment. Aon's wording, keeping information in mind while processing other information, points at this dual demand.
The example below is original and invented by us. It is not an Aon item and does not copy the real screen. Its only purpose is to give you the same mental load pattern: hold, process, recall.
1 2 3 4 A . . . . B . ● . . C . . . ● D ● . . .
To make the drill harder, add one dot per round, use a longer interrupting task, or change the dots after each interruption so you must update rather than just store.
Nine tasks in nine minutes would give an average of one minute each if the clock were shared evenly. Whether the real test shares the time that way is not publicly confirmed, so use the average only as a rough practice target.
A memory game that runs in real time is not something a screenshot tutor can replay for you, and we would rather say so plainly. Where ReasonEra helps is on the reasoning that surrounds working memory: structured puzzles, grids, patterns and rule-based items, which is the territory of its game-based and diagrammatic question types. You upload a practice screenshot, choose Quick Verify or Tutor Explanation, and read the step-by-step reasoning after you have attempted the item yourself.
A free account includes 3 free trials, and a 14-Day Pass costs 49 € if you want unlimited practice for 14 days. Pair it with the drill above and with the free practice tests below.
Assessment stages vary by role, country and intake, so double-check the specifics before you plan around them.
This tool is meant for the weeks before an assessment, but conditions for a real test are set by the employer and are often strict, so use it beforehand and sit the real test on your own.
It is a working memory test listed on Aon's candidate preparation page. You have 9 minutes for nine tasks of varying difficulty, and the test measures keeping information in mind while processing other information.
No. gapChallenge is a deductive logic test in which you fill a shape grid, while gridChallenge is listed as a working memory test. They share a word in the name and nothing more.
No. Aon states that once a timed test begins it cannot be paused and ends automatically when the time runs out. The untimed examples before it are where you can take your time.
Not on the candidate page as of 12 October 2026. Aon does say every test starts with an introduction, an interactive walkthrough and untimed example exercises.
Use drills that combine holding information with a second task, such as the grid drill on this page, and increase the load gradually. Short sessions on several days usually suit this skill better than one long session.
Use the free trials on the question types you find hardest, and compare the explanations with what you expected.
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Notes. The facts on this page come from public sources, listed in the sources section. This page was written by ReasonEra without involvement from the organisations it mentions.