Operating principles
HoduAtlas focuses on short browser games with consistent rules from attempt to attempt. Your records are reference values for personal comparison, and the site explains the device, fatigue, and learning effects that can move a score.
Six domains
- Reaction Time — The moment green appears — can your fingers outpace your brain? Five rounds averaged to pin down your reflexes. Read more
- Memory Span — Can you hold a fleeting number in your mind? Find the edge of your working memory as digits grow. Read more
- Arithmetic Speed — 60 seconds — how fast does your mental calculator run? Don't stop when you get one wrong. Read more
- Aim Trainer — The distance between eye and hand. Chase 15 targets to measure your hand-eye coordination. Read more
- Korean Letter Memory — Catch a fleeting line of Korean letters and replay them in order. A working-memory angle unique to Korean — visually denser than digits. Read more
- Stroop Test — Ignore the word and choose the ink color. Measures attention switching and interference control when automatic reading gets in the way. Read more
Why measure?
Without knowing how fast you are, there's no baseline to improve against. Numbers enable comparison, comparison drives retry. One more round, then another. No grand promises about brain training — just a clear picture of where you stand.
Where do results go?
Only to this browser's localStorage. Nothing is sent to a server, nothing is shared with others. Clear your browser data and it's gone. See Privacy Policy for details.
Which devices?
Desktop and mobile browsers alike. Touch, mouse, and keyboard (Space for reaction, Enter for arithmetic and memory) are all supported. Note that results vary by device and environment — compare on the same device for fairness.
Editorial standard
Articles are written to help readers interpret game results. We prioritize practical variables such as sleep, caffeine, refresh rate, and practice effects, and repeatedly state that a single score cannot diagnose health or cognitive conditions.
About ads
This site is free and supported by ad revenue. Before an AdSense publisher ID is configured, ad areas are not rendered; after approval, ad code appears only in content areas. No ads are placed within 100px of the game canvas to prevent accidental clicks.