Kingdom of Loathing; nothing else comes close

I’ve played alot of paperclips in classes, it just looks like a random website but it’s a really fun idle clicker thingy it’s at https://www.decisionproblem.com/paperclips/index2.html

Learn 2 Fly and Feudalism 2

I replay candybox/candybox 2 at least once a year. Fantastic incremental ascii games

Urban Dead was fun back when I played it. Used to be on the forums a lot and organize curing centres or safe zones.

Dominate Game. Great online risk game with elo system. You could play the default maps in the browser but thier client let you play tons of customer player made maps. Sadly this one got taken down a long time ago, is has a spiritual successor as Dominate 12.

Supremacy 1914. Only played 2 matches of this game, but do to its nature it was over the course of 6 months or so. I believe they have a download client now and the game is also on Steam now.

Krunker.io

I had a list of some flash games I used to obsess over, but I can’t find it right now. I’ll throw Sonny 2 as my recommendation, I beat that game many times and I still come back to it every now and then. It’s a top-tier RPG.

I would also recommend Gemcraft and Bloons TD, but they have premium sequels now that are way better than the web games.

I remember spending a lot of time playing browser games from Nitrome.

Mutiny, that cave runner game, Dirk Valentine, Ice Breaker, Bad Ice, etcetera.

I also played a lot of the Bloons series. Hell, when I found out about BTD5 flash, I thought it was some fake fan made game that would give me a virus.

For me this is a hard toss up between Pizza King too and the Submachine series, the Submachine series is an amazing escape/puzzle style series that has a really good story

and Pizza King 2 is the best management style Pizzeria Simulator game that I have found to date, many of those management style games focus more on the cooking aspect than the management aspect but this one takes the cake with being an actual management Sim instead of a cooking

cookie clicker, that chromium dino game. I think I also did dark room at some point.
that pokemon browser game. There’s also a taiko game out there. (haven’t checked lately)

Slither.io is definitely my most played browsergame. It gets way more fun with a mod that lets you zoom out a little, as the bigger you get the worse the experience normally gets…

diep.io and only domination. Stopped going when they put that game mode on some stupid rotation.

Man I miss the Flash era.

I spent a ton of time in Kingdom of Loathing. I kept an old laptop that still had a flash enabled browser for a few months to play Bloons Tower Defense 4.

There was this game, I forget the name of it, but you had to build and drive little vehicles to overcome challenges. It was technically amazing for a Flash game, and I’d love to have it back.

Penguin attack

I’ve spent a truly mind blowing amount of time on MissionChief. They don’t give exact stats, but I’d say I’ve played at least 2k hours over the last 4 years