可以和朋友在线一起玩的Difficult游戏共 583 款，包括Small World、RaceRoom Racing Experience和Revolution Ace。
全部游戏: 24
CONTROL FANTASY RACES, SET OFF TO CONQUER NEW LANDS, OVERTHROW YOUR ENEMIES AND CLAIM THE VICTORY! In this digital adaptation of the legendary board game, dive into a world inhabited by whimsical fantasy races.
RaceRoom is free to download and built on true-to-life physics and Force Feedback. Drive DTM, FIA WTCC, WTCR and a huge library of cars and tracks—including the most up-to-date Nordschleife. Jump in, race instantly, and expand your garage with a massive selection of content.
A deep, tactical shoot'em up. With every takedown, you’ll earn cash and xp to upgrade your ship and unlock new abilities. Online and local co-op. Unique versus mode. Realistic physics and water simulation.
与朋友探索回合制奇幻世界，培养英雄与军队，并在敌对的统治者之间建立脆弱联盟。
Leap into a beloved platforming adventure that moves like a living cartoon. Punch, glide, and explore 60+ levels across the Glade of Dreams, solo or with up to three friends in local co-op.
和朋友一起进入 Realm of the Mad God Exalt，参加人潮涌动的在线首领战、探索分支地牢，并从19个职业中选择。角色阵亡后会永久消失。
在线或通过 LAN 与朋友并肩挑战色彩鲜艳、武器丰富的 FPS 战役，也可以切换到对战模式。
Take on the role of a hardened career criminal executing intense, dynamic heists in constant pursuit of the next “big score”
在Serious Sam 3: BFE的埃及战役中合作作战：线上最多16人，或本地分屏最多4人。
Giana Sisters: Twisted Dreams is a blistering hardcore platformer with contrasting worlds.
Choose between different factions, with their own set of expendable soldiers, mechas, and weapons. Protect your brain, mine gold, and destroy the enemy cortex in his bunker complex!
Magicka is a satirical action-adventure game set in a rich fantasy world based on Norse mythology. The player assumes the role of a wizard from a sacred order tasked with stopping an evil sorcerer who has thrown the world into turmoil, his foul creations besieging the forces of good.
Over 20 years of legendary space battles! Explore a massive living universe of danger and opportunity in a challenging and highly rewarding space adventure. Fight, trade, build, and connect with a universe driven and shaped directly by players.
Three years after the conflict in Chernarus, portrayed in the original Arma 2, a new flashpoint explodes in the Green Sea Region. Coalition forces led by the US Army are deployed to Takistan to quickly restore peace and prevent further civilian casualties.
Take control of Lara and her new partner Totec, a Mayan tribesman, and uncover the ancient artifact known as the "Mirror of Smoke" in this all new action adventure game.
最多16人在线合作闯过街机风格FPS战役，也可以启动Fusion 2017，与最多4人在本地分屏游玩。
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。
A turn-based online fantasy card game. No character leveling, no grinding, no deck building - just 100% skill-based and fast-paced card battles!
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.
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.
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。
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.