Dungeon World. I reserved this answer for a game that I’ve actually played rather than the many that I haven’t yet, such as D&D 5, GUMSHOE and LotFP.
I seriously love this game. Easy, fast and entertaining. While I can easily adopt the game’s core philosophy into any other game system, the “10+ you succeed, 7-9 succeed at cost and 6- something bad happens” is built right into the system.
Dungeon World has forever changed the way that I game—as both a GM and as a player—and so I owe a lot to it.
I do admit that I’m a bit turned off by the endless swarm of Playbooks. I feel that it is seriously getting out of hand. I think that just about everything can be covered with just the core classes,and some of the “first wave” variations from the makers of Inverse World and Grim World.
Great game: I can’t recommend it enough.
19th – Favourite Published Adventure
20th – Will still play in 20 years time…
21st – Favourite Licensed RPG
22nd – Best Secondhand RPG Purchase
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