Neal Agarwal is full of fun and slightly insane ideas, which shouldn't surprise anyone: he's the creator of the (in)famous Password Game, and his neal.fun site has more cool but pointless mini-games, like this IKEA captcha, which he recently presented on X/Twitter.
It's all in the name: you need to assemble furniture to pass the captcha, that's it. It's time-consuming, it's too complicated, but it's undoubtedly fun, like all Agarwal's projects, including Stimulation Clicker, his "ADHD brainrot" browser game.
It's not on his site yet, but you can spend some time with other masterpieces, like Draw a Perfect Circle, Design the Next iPhone, and Absurd Trolley Problems.