Wolfenstein 3D was my first video game. My brother and I had the Shareware version on our [unknown type] family computer running Windows 3.1. No soundblaster for us so we were treated to the generic alternative sounds from our built-in PC speakers (maybe somebody can add some illumination to this?). I still remember the cheat code (M+L+I) 25 years later and probably still know most of the secret passages. Lots of good memories from inside the castle.