aSMtris – Tetris in assembly language (2016)
sebastianmihai.com
sebastianmihai.com
The Hugi Size Coding Competition (unfortunately defunct now) from 2003 had a Tetris-clone competition, and the winner was 363 bytes: http://www.hugi.scene.org/compo/compoold.htm#compo22
And to think Super Mario 64 was a whole 8MB.
Pretty sure the original Tetris was also written in assembly because there was little choice in the matter though.
[1] https://en.wikipedia.org/wiki/Elite_(video_game)
[2] https://gdcvault.com/play/1014628/Classic-Game-Postmortem