This is about a collection of about 300 Apple II games playable in the the browser, but the best part comes at the end of the article:

    4am meticulously and [sic] carefully walks through 
    the entire process of cracking each program. The 
    code, the tracing of boot flow, the missteps, and 
    even the internal thought processes that lead to the    
    solved mystery. 
    They’re magical. And every 4AM item has one.