It's not often you run into a game that plays differently depending on if you had CGA, Tandy, or EGA hardware, but this is one of them. Actually, it plays differently in all of its various ports and iterations as well, even though the levels are pretty much the same across the entire spectrum. Nowadays, a game on one system plays pretty much the same on all other systems, but because the hardware specs were so vastly different between various consoles and computers of the 80s, making a game on multiple systems usually meant completely different source code for each. Oh yeah, the story for this game is ridiculous too.