Let's get this going.
What's your favorite OSR?
Ones I have, * means played.
OD&D *
AD&D *
Basic Fantasy *
Castles & Crusaders
Old School Essentials (OSE)
Hyperboria
OSRIC
Advanced Labyrinth Lord
Swords & Wizardry *
Pathfinder 2e
Dungeon Crawl Classic
Tunnels & Trolls
My go to is AD&D...
Tell me about Warlock