Here's a great interview with the hungarian developer, Kriz, who recreated this old game as closely as he could from scratch. I found it interesting he didn't even try to crack into it and look at the source code. He just watched closely and recreated what he saw. This is the 4th such game he is behind and I hope he keeps going!
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Wizard of Wor
There seems to be a trend of re-creating classic 8-bit games in JavaScript at the moment, including the recent and excellent Survivor. B