NES Contra, recompiled for the web
The 1987 run-and-gun as native code in a tab, two players over WebRTC
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Rokz
Apogee's 1990 Kroz dungeon crawler, rebuilt in the browser from Pascal source
It is a faithful port where every level, monster and bug is extracted from the original code and verified byte for byte, playable in a tab.
Rokz is a browser port of The Lost Adventures of Kroz, Apogee's first game from 1990. Rather than recreating levels by hand, a pipeline parses the original Turbo Pascal and level files, re-emits every layout row and diffs it against the source, so all 75 levels, including the 34 defined as random scatter tables, match the 1990 data exactly. Text-mode characters become Dungeon Crawl Stone Soup sprites and the PC speaker becomes a Web Audio oscillator that also drives the game clock, as the original did. Trophies, difficulty, speed and cheats are included, and it is GPL-2.0 on GitHub.
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