This is a lot of fun. My 'biggest' gripe is that in the shapes quiz Tuvalu and the Seychelles are so tiny that no image displayed for me that I could see.

Huh, it has grouping for the multiple choice, so for a red and white flag (2 horizontal stripes) with some stars the options are Monaco, Indonesia, Singapore, Poland. All of which are horizontally striped and have those 2 colors.

Same with the Nordic flags, which have similar geometry but different colors.

Nicely curated.

Nicely made! I thought I'm good with flags, and then there come a question of jordan, palestine and two more similar flags.

I made a similar but uglier little party game https://geo-dude.com for my kids. Supports up to 4 players

Sinister mode: Romania versus Chad, Monaco versus Indonesia, Senegal versus Mali, Egypt/Syria/Iraq/Yemen, etc.

It should show the meaning of the colors and symbols of the flag after the user answers.

It reminds of Fun with Flags segments in Big Bang Theory

Nice website! Could you tell use a bit more about this project? What prompted you to make it? I've been looking for a good ad-free, account-free minimal flag learning website and this looks like a good fit.

Fun, clean, and dangerously addictive got 15/20

Awesome app! I got 14/20.

The flag of Paraguy says "Paraguy" on it, you might want to blur that.

It’s really a great place to cure boredom

Probably a useful bookmark if you’re going on The Amazing Race. They always throw in a flag quiz toward the end.

18/20 on hard, some misclicks :P Anki training works!