You are right, Ok I will replace it by another link with similar content (it's my second favorite) Interfacer.xyz. Source: about 3 years ago

The website links to Flexbox Froggy but via a link that requires you to register an account, but you can access it directly via https://flexboxfroggy.com/. - Source: Hacker News / about 14 hours ago

Flexbox Froggy: Learn CSS Flexbox by playing this game. - Source: dev.to / 3 months ago

Flexbox is an important topic of CSS and you can learn it by playing a game called Flexbox Froggy. You can easily learn the properties of Flexbox while having some fun. - Source: dev.to / 5 months ago

This started improving for me recently when I spent more time really learning flexbox and flexgrid. They are part of CSS so no installs needed. It’s a different way of thinking but I’m finally good enough with flexbox that I can tell when I need it and make productive use of it. Knowing these patterns makes a difference for me, since now I can assemble the blocks better than before when I’d just try mostly random... - Source: Hacker News / 8 months ago

There are some games which teach them quickly. http://flexboxfroggy.com/ http://flexboxdefense.com/ and https://cssgridgarden.com/ perhaps 1-2 hours to do all three and then layour is a breeze. Source: 11 months ago