What is the National Flags Color Challenge?
The National Flags Color Challenge is a themed color matching game where you recreate 10 curated colors such as Old Glory Red, Union Blue, Italian Flag Green using HSB sliders.
National Flags color challenge
Match national flags by eye
Tune hue, saturation, and brightness to recreate 10 curated colors from national flags. The target stays visible, but the exact hex is hidden until you submit.
Free · No signup · No ads · HSB sliders
Featured prompt
Old Glory Red
A stripe snapping in stadium wind
Target
Hex hidden until submit
Your live match
Adjust with HSB
Example colors
What you will match
Each round gives you a real-world prompt, a themed doodle anchor, and HSB controls. Try to match the visible target without seeing the hex value.
Old Glory Red
A stripe snapping in stadium wind
Stripe · Ceremony · Signal
Union Blue
Deep field behind bright stars
Field · Star · Night
Italian Flag Green
A crisp tricolor at a street café
Tricolor · Fresh · Street
French Flag Red
A parade banner crossing the square
Banner · Parade · Bold
German Flag Gold
Gold band under black and red
Band · Contrast · Gold
Nordic Cross Blue
A blue cross over winter sky
Cross · Winter · Clear
Nordic Cross Red
Red cloth against snow
Cross · Cloth · Snow
Mexico Green
Festival bunting over the plaza
Bunting · Fiesta · Green
India Saffron
Morning flag light before a crowd
Saffron · Dawn · Crowd
Brazil Field Green
A green field around a golden diamond
Field · Rhythm · Matchday
How to play
Study the target color and prompt, then tune Hue, Saturation, and Brightness until your live doodle visually matches the target.
What is HSB?
HSB separates color into hue angle, saturation intensity, and brightness value. It is easier to reason about than raw hex codes.
How scoring works
After you submit, Color Challenge compares your guess with the target using perceptual color distance and shows accuracy, ΔE, and H/S/B breakdowns.
National Flags FAQ
National Flags color matching questions
Search-friendly answers about playing the National Flags challenge, HSB matching, hidden hex values, and scoring.
How do I play the National Flags challenge?
Look at the visible target color and themed doodle, adjust Hue, Saturation, and Brightness until your live match looks close, then submit to reveal the exact hex and accuracy score.
Why is the target hex hidden?
The target hex is hidden before submit so the challenge stays visual. You match by eye first, then learn the exact hex, ΔE, and H/S/B breakdown after your guess.
How is color accuracy calculated?
After each guess, Color Challenge compares your color to the target using perceptual color distance and shows an accuracy score, ΔE value, and separate Hue, Saturation, and Brightness feedback.
Can I play National Flags without signing up?
Yes. The National Flags challenge is free and works directly in your browser with no account, no login, and no payment required.
Ready to test your eye?
Play the National Flags challenge
Start with the first prompt, build a streak, and reveal the exact hex only after each guess.
Start MatchingRelated challenges