In this game, you can…

• …fight while managing your gas mask: put it on, swap filters before you suffocate, and wipe blood and rain off mid-shootout.
• …spend the same bullets as both ammunition and money, choosing between winning a fight now or affording supplies later.
• …survive the Library by lowering your weapon and not making eye contact with the monsters, turning the encounter into a slow standoff.

In this game, you can…

• …trade with bullets that are also your strongest ammo
• …race a gas mask filter timer on the surface, swapping filters before you choke
• …stack up compassionate actions and careful eavesdropping to unlock a different ending at the last second

In this game, you can…

• …watch sand, snow, and water foul your guns until they jam, then stop to clean them by hand.
• …patch a cracked gas mask with duct tape mid-mission, then hunt down a workbench before the next toxic area.
• …ride a modified steam locomotive across Russia as seasons shift from spring to nuclear winter.

In this game, you can…

• …carry a garden gnome through the entire game, hauling it in and out of the car without losing it.
• …trigger an antlion invasion by stomping their grubs after being warned the nest will hear you.
• …run out of rockets in the finale and improvise by using the car and throwing tree trunks at towering enemies.

In this game, you can…

• …spend roughly a quarter of the campaign in a rebuilt Xen that plays like its own ecosystem, with new creatures and reimagined spaces.
• …get hunted for a long stretch by a giant alien behemoth, then finally turn and fight it when there's nowhere left to run.
• …trigger an experiment that rips open reality and starts an alien invasion, all while you stay in control and the story never cuts away.

In this game, you can…

• …use a gravity gun to turn junk into weapons, tools, and stepping stones mid-fight.
• …launch a saw blade and slice an enemy clean in half.
• …pick up a random can, throw it at a guard, and watch him chase you down.

In this game, you can…

• …crawl seamlessly across floors, walls, and ceilings, slip through vents, and pounce out of the dark to shred a whole room before anyone turns around.
• …hunt Marines from the treetops while cloaked, tag them in heat vision, mimic human cries to split them up, then drop in with a huge leap for a trophy execution.
• …play a mode where one random player becomes the Alien, and anyone who dies respawns on the Alien team as the infestation spreads.

In this game, you can…

• …split your metal pipe into two weapons, dual-wield them, then snap it back together into a sledgehammer.
• …watch the story pivot into occult chaos with ancient relics, flaming zombies, and something huge waking underground.
• …find hidden Wolfenstein 3D-style nightmare levels tucked into the campaign as secret throwback missions.