I tried to google them instead and I found some interesting stuff from various articles, but most of them seems to be dead now. A funny mempool explorer that replace block data with something funny, an imaginary blockchain that replace OP_RETURN and so on. I guess it's literally for fun and the devs just let them die after publishing it. I guess my definition is skewed towards funny instead of fun.
I tried that too (when I reached around the 12th page of the Service announcements board

) and found those similar dead projects. Shame though, it would be nice to see and try them.
I wonder if there's an April fool viewer that scrap the forum data and make a historical UI from that, that sounds interesting.
No idea. There are some archives on April 1 this year (and maybe a couple of years ago, too), but, I couldn't see the changes made in the forum, especially that green theme.
https://web.archive.org/web/20260000000000*/https://bitcointalk.org/Wow. A real-life crypto farming simulation. I'd love to imagine this project managed to continue and grow; the viewers could feed not just chickens but all sorts of farm animals.

I've come across "What if Bitcoin?", that's whatifbitcoin.org. It seems it falls exactly within the category of "fun yet somewhat useful". What makes it fun is the "what if" part. They have a 'what could have been' or 'regret' or 'missed opportunity' calculator. You can put the amount you could have invested, choose a specific date in the past, and find out how much Bitcoin you could have bought.
Furthermore, it tells you how much gaming rigs, Nvidia stocks, restaurant visits, car rentals, boat tours, among others you could have bought today with your investment.
When I tried it, I wasn't exactly thinking of what could have been because the amount I put was the amount I used to have. The regret wasn't about not buying but about buying but selling
tragically early. It's fun to sometimes look back and face your regrets.
But aside from the fun, the site is also educational.
It sounds like a site that could amplify someone's depression from selling their BTC early.

It's a fun site nonetheless.
I'd like to share this service:
https://home.txcity.ioIt's a nice way to compare TX between multiple blockchain and the number of transactions, where the blocks are likened to a bus and the transactions to objects waiting for this bus.
This is cool too. It's like a traffic jam monitoring service but for crypto.
