My first adventure as a player was B1, In Search of the Unknown, in the Holmes Basic box with chits instead of dice. My dad ran the game for my brother and me. I don't remember what characters we played, though I think one of us was a magic user. At least one PC was killed by a skeleton. After that first session, my father decided that it was too much work, and turned it all over to us. Thus B1 was also the first adventure I ran as a DM for my brother and some other friends. At the time, we didn't have any experienced mentors, so we thought the map should be out on the table for everyone to see. I distinctly recall whenever the PCs passed a secret door, they would keep rolling until someone (usually the elf) spotted it.
I would enjoy running or playing B1 again. At least for a while. Most of the folks I game with don't have much patience for large dungeon maps like this anymore.