[vekm]

It's hard to believe, but exist games where you need to code in assembler! 
Games for †ru3 h4ck3rs

My favourite - EXAPUNKS.

READ ZINES - Learn to hack from TRASH WORLD NEWS, the underground computer magazine. Tutorials, hacking tips, secret information.
WRITE VIRUSES - Program your EXAs (EXecution Agents) to tear through networks, replicate themselves, trash files, terminate other EXAs— and leave without a trace.
HACK EVERYTHING - Hack banks, universities, factories, TV stations, highway signs, game consoles, the government... oh yeah, and your own body.
TAKE DOWN YOUR FRIENDS - Compete with your friends by running your programs directly against theirs in all-out hacker battles. Make every cycle count.

[vekm]

Another one, predecessor of exapunks - TIS-100.

Pretty similar game, but if exapunks reminds vibes of the '90s, TIS-100 right from '70s.

[vekm]

SHENZHEN I/O

A game where you need not only to write code in assembler, but also to design electronic devices.