I don't like HackerRank but I have done few https://devskiller.com/ and they are excellent. Source: over 1 year ago

There are websites (https://devskiller.com/, for example) that sell pre-screening tests to companies that hire devs. I know people from all these professions and they take a test when they apply for a position at a new company. I've applied for several non-translation positions and they all had tests. I really don't know what you're talking about. Source: about 2 years ago

Two companies that used https://devskiller.com The problems aren't necessarily easy, but they were a holistic direct representation of the required skill set. Source: over 2 years ago

You could sign up for a trial of automated online .NET testing tools and do some trial runs yourself, e.g. https://devskiller.com/. Source: over 2 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 / 14 days ago

Flexbox Froggy: Learn CSS Flexbox by playing this game. - Source: dev.to / 4 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 / 6 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