Tough one! I think that I’d have to go with Keep on the Borderlands.
A friend of mine was clearing out his collection and sold this to me for next to nothing. I may not ever run it, but it is an important piece of work from the hobby.
I’m glad that I own this! Very charming and not all that bad of a slightly sandbox-y campaign. As in, it had no plot other than “go and explore this huge dungeon location”. I’d like to run it in my 5th edition D&D campaign.
23rd – Coolest looking RPG product / book
24th – Most Complicated RPG Owned
25th – Favourite RPG no one else wants to play
26th – Coolest character sheet
27th – Game You’d like to see a new / improved edition of…
28th – Scariest Game you’ve played
29th – Most memorable encounter
30th – Rarest RPG Owned
31st – Favourite RPG of all time