I've had a chance to go through the wishlist data from the opening of event registration in 2015 to look at what games were the most "in demand" - which in this context specifically refers to highest unserved demand: tickets that folks had in their wishists beyond what there was the scheduled capacity to actually fulfill.
This isn't a measure of overall number demand or actual players, it's just a look at how many people wanted tickets and simply couldn't get them.
There are many games that dominate Gen Con or the industry as a whole (Pathfinder and Magic, as two big examples) that aren't on this list simply because while there is huge demand for those games, there was also huge spply. Some official events (like D&D 5th edition run by Baldman Games) are also not in the list because they were their own event category or were specific to just that company.
So what we have is a list of games that had a lot of demand but relatively few events scheduled for them. If you are looking to run a game at Gen Con but aren't sure where to start, this list would be a good jumping-off point. Chances are if you run one of these games, you can count on your event filling up and maybe even having folks still showing up with generics and hoping for overflow. It's rather RPG-heavy, but that speaks more to the particular habits of RPG players than anything else, I think.
There are some weird artifacts in the raw data because there are many different ways to list game system and rules edition for many games at Gen Con, so the list should not be taken are gospel or an objective measure of popularity.
Don't use this list to argue the merits of one game vs another - every game on this list has way more people who want to play it than could, and that should be enough for us all to have fun playing more games.
- Call of Cthulhu, 6th or 7th editions
- Star Wars RPG, Fantasy Flight editions
- Dungeons & Dragons, 1st, 3.5, & 5th editions - possibly tied to specific companies or campaigns.
- Savage Worlds
- Shadowrun
- Numenera
- Trail of Cthulhu
- King of Tokyo
- Star Wars: Imperial Assault
- Paranoia
- Fate
- XCOM: The Board Game
- Hero System
- The One Ring
- Eclipse Phase
- Warhammer 40,000 Roleplay: Dark Heresy
- Dread
- X-Wing Miniatures
- Deadlands
- Descent: Journeys in the Dark
- 13th Age
- Dungeon Crawl Classics
- Dungeon World
- The Dresden Files
- Night's Black Agents
- The Strange
- The Undercity
- Sheriff of Nottingham
- Catan
- Outbreak: Undead
- Eldritch Horror
- Firefly, both board game & RPG
- Betrayal at House on the Hill
- Luchador: Way of the Mask
- Baker Street
- Atomic Robo
- Delta Green
- Doctor Who: Adventures in Time and Space
- Five Tribes
- Mutants & Masterminds
- Space Hulk
- Arkham Horror
- Lords of Waterdeep
Derek Guder
Event Manager
Gen Con LLC