AI War: Fleet Command：把合作游戏变成银河战役
和最多七位好友一起，展开一场对抗两个 AI 帝国的长期策略战役。扩张能壮大抵抗军，但摧毁敌方关键设施也可能引来更多注意。
992 篇评测中 84% 为好评当前玩家: 3US$9.99
Difficult · Singleplayer：适合一起玩的游戏
可以和朋友在线一起玩的Difficult · Singleplayer游戏共 391 款，包括AI War: Fleet Command、DOOM + DOOM II和Quake III Arena。
全部游戏: 24
DOOM + DOOM II
Developed by id Software, and originally released in 1993 and 1994, the definitive, newly enhanced versions of DOOM + DOOM II are available as a combined product.
25,692 篇评测中 95% 为好评当前玩家: 316US$9.99
Quake III Arena
The greatest warriors of all time and space have been summoned to battle for the amusement of an ancient alien race. Wield a variety of guns and power-ups as you fight for glory against ruthless combatants in this fast-paced single-player and multiplayer FPS.
3,483 篇评测中 95% 为好评当前玩家: 44US$14.99
DEFCON：与好友周旋于核战争边缘
指挥六个世界区域之一。雷达、舰队、轰炸机和核导弹发射井让 DEFCON 成为一场紧张的联盟博弈，每个人都想尽量少输。
3,509 篇评测中 87% 为好评当前玩家: 22US$11.99
Deathmatch Classic
Enjoy fast-paced multiplayer gaming with Deathmatch Classic (a.k.a. DMC). Valve's tribute to the work of id software, DMC invites players to grab their rocket launchers and put their reflexes to the test in a collection of futuristic settings.
2,452 篇评测中 82% 为好评当前玩家: 3US$4.99
Half-Life
Named Game of the Year by over 50 publications, Valve's debut title blends action and adventure with award-winning technology to create a frighteningly realistic world where players must think to survive. Also includes an exciting multiplayer mode that allows you to play against friends and enemies around the world.
118,309 篇评测中 96% 为好评当前玩家: 1,191US$9.99
Resident Evil 3
Jill Valentine is one of the last remaining people in Raccoon City to witness the atrocities Umbrella performed. To stop her, Umbrella unleashes their ultimate secret weapon: Nemesis! Also includes Resident Evil Resistance, a new 1 vs 4 online multiplayer game set in the Resident Evil universe.
91,769 篇评测中 84% 为好评当前玩家: 0US$7.99
TEKKEN 7
Discover the epic conclusion of the long-time clan warfare between members of the Mishima family. Powered by Unreal Engine 4, the legendary fighting game franchise fights back with stunning story-driven cinematic battles and intense duels that can be enjoyed with friends and rivals.
68,280 篇评测中 82% 为好评当前玩家: 0US$5.99
CODE VEIN
In the face of certain death, we rise. Team up and embark on a journey to the ends of hell to unlock your past and escape your living nightmare in CODE VEIN.
46,553 篇评测中 83% 为好评当前玩家: 0US$59.99
Crypt of the NecroDancer：合作也要踩准节拍
基础版支持双人本地合作；Synchrony扩展本地人数至4人，并加入最多8人的在线模式。每一步都要跟上音乐节拍。
23,639 篇评测中 94% 为好评当前玩家: 0US$2.99
Injustice™ 2
Build and power up the ultimate version of your favourite DC legends in INJUSTICE 2. This is your Legend. Your Journey. Your Injustice.
17,570 篇评测中 85% 为好评当前玩家: 0US$49.99
SUPER CHICKEN JUMPER
A spy-chicken tries to save the world from doom in this runner/shooter game that has a little bit of everything with a touch of chicken and anime girls on top. Run for your life in 6 different worlds and shoot your way through tons of enemies until you become a legend.
4,887 篇评测中 96% 为好评当前玩家: 0US$2.99
Killsquad
Hack and slash? Check. Twin-stick-shooter? Check. 4 player coop to slay hordes of aliens & bosses with your friends? Check. Skills, upgrades, weapons, gears, talismans and more to make you stronger? Check. Wake up, bounty hunter. We have a mission for you. Time to clean up the scum of the galaxy.
2,837 篇评测中 70% 为好评当前玩家: 0US$29.99
Kopanito All-Stars Soccer
Fast-paced football game without a referee on the pitch and with crazy super-powers! It may not look serious, but we guarantee, that it is. Kopanito’s match engine is well-balanced and entirely skill-based.
2,434 篇评测中 84% 为好评当前玩家: 0US$5.99
Kung Fury: Street Rage - Ultimate Edition
The original epic introduction to the eternal KUNG FURY beat ‘em up saga. New stages, and the Hackademy. Both THE ARCADE STRIKES BACK and the A DAY AT THE BEACH campaign.
2,249 篇评测中 89% 为好评当前玩家: 0US$19.99
It Steals
AROUND EVERY CORNER. Face against stealthy antagonists that will take advantage of your expectations.
2,162 篇评测中 98% 为好评当前玩家: 0US$4.99
FORCED: Slightly Better Edition
FORCED is a challenging 1-4-player game with co-op at its heart! A mix of tactical arcade action, RPG elements and puzzles will forge you and your friends together. As slaves in the toughest gladiator school of them all, you will face a plethora of unique trials - designed to be your death!
1,778 篇评测中 74% 为好评当前玩家: 0US$14.99
Sneak Thief
Sneak Thief is a first person, shooter, strategy, stealth and puzzle game that lets you choose how you want to play. Use your wits and expertise to setup and perform heists whether that be by using brute force to smash your way through or by getting away without making a sound.
1,745 篇评测中 73% 为好评当前玩家: 0US$14.99
Star Saviors
Saviors brings the best bullet hell experience you can find on Steam. Play through 18 challenging stages in this ultimate test of tactics and reflexes.
1,535 篇评测中 80% 为好评当前玩家: 0US$1.99
Survisland / 实境求生
Survisland is a super hardcore sandbox survival game that pays great attention to restoring the real survival experience. The character has rich and realistic actions and reactions to , and the process logic of making props is no different from reality.
1,467 篇评测中 62% 为好评当前玩家: 0US$14.99
Dark Roll: Free Kick Challenge
A ball rolling game, where you take football free kicks. Single player challenges, Steam Leaderboards and ranked multiplayer. Free to play.
1,224 篇评测中 80% 为好评当前玩家: 0免费
Legend of Dungeon：四人同行，深入地牢
和最多三位朋友进入随机生成、几乎没有光线的地牢。本地合作共用一块屏幕，途中可以找到各种意外装备；倒下的玩家还有机会以幽灵形态回归。
1,220 篇评测中 71% 为好评当前玩家: 0US$9.99