The best-selling Steam games of 2015.
Games released on Steam in 2015, ranked by how many copies they have sold there since. Valve publishes no sales figures; these are Coilr's estimates from each game's reviews.
100 games, most copies first
1·The Witcher 3: Wild Hunt
21M copies · 2015
2·Dying Light
20M copies · 2015
3·BeamNG.drive
18M copies · 2015
4·Fallout 4
12M copies · 2015
5·Undertale
8.5M copies · 2015
6·Cities: Skylines
7.6M copies · 2015
7·Call of Duty®: Black Ops III
7.4M copies · 2015
8·The Isle
7M copies · 2015
9·Just Cause™ 3
6.5M copies · 2015
10·Elite Dangerous
6.4M copies · 2015
11·Batman™: Arkham Knight
4.7M copies · 2015
12·Kerbal Space Program
4.5M copies · 2015
13·DARK SOULS™ II: Scholar of the First Sin
4.4M copies · 2015
14·Tabletop Simulator
3.8M copies · 2015
15·Mortal Kombat X
3.5M copies · 2015
16·METAL GEAR SOLID V: THE PHANTOM PAIN
3.4M copies · 2015
17·Broforce
3.2M copies · 2015
18·Mad Max
2.8M copies · 2015
19·Hotline Miami 2: Wrong Number
2.5M copies · 2015
20·Verdun
2.5M copies · 2015
21·Prison Architect
2.4M copies · 2015
22·Total War: ATTILA
2.4M copies · 2015
23·Resident Evil Revelations 2
2.2M copies · 2015
24·Duck Game
2.1M copies · 2015
HELLDIVERS™ Dive Harder Edition
Heroes® of Might & Magic® III - HD Edition
Reign Of Kings
Viscera Cleanup Detail
Digger Online
Train Simulator Classic
Resident Evil
Assassin's Creed® Syndicate
SOMA
Divinity: Original Sin - Enhanced Edition
Barony
Life is Feudal: Your Own
Universe Sandbox
Hatred
Keep Talking and Nobody Explodes
Pillars of Eternity
Warhammer: End Times - Vermintide
DRAGON BALL XENOVERSE
State of Decay: YOSE
Magicka 2
Crypt of the NecroDancer
Wolfenstein: The Old Blood
Darksiders II Deathinitive Edition
Hacknet
Fallout: A Post Nuclear Role Playing Game
Trine 3: The Artifacts of Power
Assassin’s Creed® Rogue
Devil May Cry 4 Special Edition
Saints Row: Gat out of Hell
Zombie Army Trilogy
LEGO® Jurassic World
Mordheim: City of the Damned
GRAV
Primal Carnage: Extinction
Nuclear Throne
The Mean Greens - Plastic Warfare
Medieval Engineers
The Escapists
Automation - The Car Company Tycoon Game
Armello
Timberman
The Beginner's Guide
Planetary Annihilation: TITANS
RUNNING WITH RIFLES
Homeworld Remastered Collection
Titan Souls
Exanima
Mini Metro
Cat Goes Fishing
Fran Bow
iRacing
Car Mechanic Simulator 2015
Software Inc.
Refunct
One Piece Pirate Warriors 3
Galactic Civilizations III
Victor Vran ARPG
Garfield Kart
Party Hard
Hyperdimension Neptunia Re;Birth1
Tales of Zestiria
Planetbase
Five Nights at Freddy's 4
60 Seconds!
Hand of Fate
SUNLESS SEA
Might & Magic® Heroes® VII
rFactor 2
12 is Better Than 6
SimplePlanes
NEKOPARA Vol. 0
Jotun: Valhalla Edition
Rebel Galaxy
Grim Fandango Remastered
METAL SLUG
War for the Overworld
Copies sold on Steam only, estimated from each game's Steam reviews, weighted by when they were written, how big the game is and who plays it (co-op games and story games differ most). Checked against 170 games whose developers announced their sales, the median estimate was 30% off. Free-to-play games are not ranked: their “owners” are everyone who pressed Play once. Neither are adult games, software, or games Steam no longer sells on their own (Grand Theft Auto V Legacy is the biggest): without a price there is no telling a delisted paid game from a closed free one.