Number Recall

Read a number sequence, then type it back: spans grow from 3 up to 12 digits.

GAME PREVIEW · EXAMPLE RUN

Number Recall

Watch the digits, then enter them back in the same order.

Watch how a run plays out…

STATIC PREVIEW · 1 — REPRESENTATIVE GAMEPLAY

Level 3Digits 5Strikes 1 of 3

4 7 • • •

Enter the digits in the order shown

2 — EXAMPLE END-OF-RUN RESULT

EXAMPLE RESULT — NOT CALCULATED

SESSION COMPLETE · EXAMPLE

Longest sequence recalled

7 digits

Levels cleared

Level reached

Strikes

Play duration

3:17

Descriptive summary only · not a clinical assessment · preview resets in a moment…

Reduced motion is on: this preview shows a static frame instead of an animation.

Start game

Game challenge

Recall the full 12-digit sequence

Can you complete the full challenge?

Watch the digits, then type them back in the same order. A wrong sequence is a strike: three strikes end the run.

How to play

Digits appear one at a time: watch carefully.
When the sequence ends, type it back in the same order using the keypad or your keyboard.
⌫ deletes the last digit; OK submits once the full length is entered.
A wrong sequence is a strike: three strikes end the run. Ten levels, from 3 up to 12 digits.

The Science

Number Recall challenges your ability to hold a sequence of numbers in mind and recall it in order—a skill related to working memory.

In our 2026 randomised, double-blind, placebo-controlled study, 100 adults aged 18–45 with self-reported dissatisfied sleep took 2 g/day of Magtein® or placebo for 6 weeks.

Magtein® produced a greater improvement in NIH Toolbox List Sorting Working Memory scores: 6.00 points versus 1.38 points with placebo (p < 0.05) [1].

Working memory helps us keep information available while completing a task, such as remembering a number long enough to enter it.

Number Recall is inspired by this cognitive domain, not the clinical assessment used in the study or a diagnostic tool.

Remember. Hold. Recall.

REFERENCE

[1] Lopresti and Smith, 2026