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Archive.org has a bunch of MS-DOS games playable in your browser, Lemmings is one: https://archive.org/details/lemmings_original_ms-dos_201705

While that'd work, keep in mind Lemmings is an Amiga game.

MS-DOS is just one of many ports.

You'd need a amiga floppy compatible reader for the PC[1] and then use an emulator

You'd need a floppy image. It's easier to just download one.

Amigaforever's KB is missing recent developments that make this very easy, e.g. GreaseWeazle.

I do not, but there is an open source clone called Pingus that stays close to the spirit of the original: https://pingus.seul.org/

Web based DOS emulators are plentiful - something like "Play lemmings online" will give you a few options if varying shadiness.

Someone wrote a version using JavaScript that seems pretty straightforward (and no ads!)

It has plenty of ads now.

I'm sure someone would love to turn the game into a freemium-game where if you wish to use bricks you've got to have LemmingCoins.

oh, perhaps Pi-hole was saving me!