Flash Games for Today's Times

Browser Games

Browser games are not that popular due to the 2020s having modern and widely used browsers not supporting the original Flash Engine. Either websites went to HTML5 games or replaced their engines with Ruffle or others.

Newgrounds. This is a special one as they allow any users to post content. They replaced their engine with their downloadable one.

There's tons of generic flash games, like the following:
CrazyGames
Armor Games
Kongregate
Poki
Addicting Games
NuMuKi

If you want to support high quality games, you can do so on Steam.

App Games

Not many Flash games are on apps, mostly after 2020.

Flashpoint, it contains a ton, mostly flash games.
Archive.org, it contains tons of SWF files for the App installation.