How quick is
your brain
under load?
Play the quick 60-second math sprint, reveal your Mental Tempo Type + Processing Speed Score, and see what keeps your brain quick under pressure — not just before your first coffee wears off.
★★★★★ 64,000+ players · 100% freeSolve it before the bar empties
A simple sum will flash. Tap the correct answer fast — the timer shrinks every round, and the math gets a little harder. This tests the quick mental processing that grinds to a halt when you're depleted.
Tap 13 before the bar runs out.
skip the game →Building your Tempo Profile…
The Slow-Cruncher
Here's the part most people miss: a brain that crunches slower by afternoon isn't just tired — researchers describe it as depleted from the thousands of decisions you've already made. The good news is that this is one of the more addressable patterns.
It's called decision fatigue
You make tens of thousands of small choices a day. Each one fires glutamate in the prefrontal cortex. When it builds up faster than your brain clears it, processing slows, choices get harder, and the 3pm wall hits. These are the 5 signs:
Simple mental math and quick calls take longer than they should.
Picking the easiest option instead of the best one.
Putting decisions off until the pressure builds.
Reacting impulsively instead of responding thoughtfully.
Sharp in the morning, foggy and slow after lunch.
The conventional fix is more caffeine — but coffee wakes you up, it doesn't help your brain clear the buildup. That's the gap the next step targets →
Numin — clinically studied focus
A once-a-day drink built around the buildup behind decision fatigue. No caffeine kick — you simply notice the slow-down doesn't arrive. Tastes like lemon iced tea.
Formulated around glutamate clearance in the prefrontal cortex — the brand's described mechanism for decision fatigue.
Rhodiola rosea, L-Tyrosine, Curcumin (Curcugen™), MSM and Crominex 3+ — chosen for cognitive support under load.
Steady clarity without the coffee spike-and-drop. You notice what doesn't happen.
Free shipping, 30-day money-back guarantee, pause or cancel anytime.
Choose your plan
"I work in finance — by 3pm my mental math used to crawl. Now the numbers just come. Hard to overstate."
"Stimulants spike my anxiety. This doesn't. Quick when I need it, calm the rest of the time."
"I'd been burned by energy supplements before. This isn't about energy — it's about staying sharp. Six hours in, no jitters, no crash."
[*] Manufacturer-cited clinical trial, reported as published in Frontiers in Nutrition (2025). Figures are the brand's claims and have not been independently verified on this page.
[1] Baumeister & Vohs — research on decision fatigue & self-regulation. Overview
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