Sierra had another release pre-King's Quest that was packaged and titled differently by IBM -- Sierra's Apple II (et al.) game was "The Wizard and the Princess", while IBM's later version of the same game (developed by Sierra but published by IBM for the PC) was titled "Adventure in Serenia." My understanding is that IBM approached Sierra to come up with something dramatically new for the PCJr., and the AGI engine was born, so the PCJr. version likely preceded the broader multi-platform releases.
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