"Castle Smurfenstein was a parody of Silas Warner's original Castle Wolfenstein game written for the Apple ][ and the Commodore 64 and several other computers in the early 80s. Castle Wolfenstein was a terribly fun and addicting game but something was missing. Nazis just didn't seem that threatening to a suburban high-school kid in the early 80s. Smurfs. That was the real threat now. "