TotK Recomp
Tears of the Kingdom as a desktop binary, built from your own dumps
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NES Contra, recompiled for the web
The 1987 run-and-gun as native code in a tab, two players over WebRTC
The method is the interesting part: each routine was translated by agent then diffed against Mesen, a pattern worth borrowing for any port where correctness is the job.
This is Contra rebuilt rather than emulated. Starting from vermiceli's annotated disassembly, the maker converted the 6502 assembly to C a routine at a time and compiled the result to WebAssembly, checking each step against the Mesen emulator frame by frame. Two-player runs by deterministic lockstep: both browsers run the same C core and trade only button states, with four frames of input delay and WebRTC through PeerJS. You supply your own ROM, which the maker added to stay clear of Konami. Chrome is the tested browser.
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