Death animations - every hostile flashes white-hot, then buckles and slumps into a heap: flesh bleeds out, insects splay, machines collapse in sparks and scrap, and viruses swell and burst

Gun designs - all ten guns are redrawn with their own shape and muzzle flash, from a needle SMG with a glass vial magazine to twin phase rails, a shoulder launcher and a frost sprayer

Volatile Blister - runs at you and bursts; shoot it first, ideally inside a pack

Mitotic Cell - splits into two fast Daughter Cells when it dies

Phage Lens - snipes along a red sightline that locks just before it fires; step off the line or behind cover

Symbiont Mender - hangs back and heals the worst-hurt hostile near it

Boss phases - every boss fights in two or three named phases, adding chained charges, shockwave slams, spiral barrages, blinks, spore mines, toxic trails or escorts that shield it

Vertical look - a setting for how fast the view tilts compared with turning, for mouse and controller, at 40% by default

Research hub - Research opens on a choice of Upgrades, Mutations and Strains

Animated title - a slow camera drifts through a floor of wandering hostiles behind the menus

Reloads - the gun lowers, jolts as the magazine seats and comes back up, with sounds for each gun family

Enemy sounds - alert, pain and death cries in four voices, heavy footsteps, and sounds for the new hostiles and boss phases

Gun mods - every gun you own comes back as Mk II and Mk III mods, each adding something new: ricochets, burning pellets, seeking rockets, stuns, shrapnel and more.

Evolutions - a Mk III gun with its paired upgrade evolves into a new weapon: the Singularity Pistol, Breach Cannon, Needle Storm, Pulse Lance, Annihilator, Solar Repeater, Payload Cascade, Storm Conductor, Flechette Tempest or Absolute Zero.

Mutations - 12 run-changing loot cards, from kills that detonate and a freezing dash to a field that heals the whole team. Four are in every loot pool; unlock the rest in Research.

Strains - spend samples on a starting loadout with its own gun or mutations.

The Director - a new final boss on round nine. It releases Apex or Patient Zero from containment, shields itself while that boss lives, then vents reactor shockwaves you have to jump or dash through.

Breach Levels - win the Campaign to unlock ten harder levels, each worth more score.

Daily Breach - one seed a day, the same for everyone, with its own leaderboard.

Play a Seed and Copy Seed - replay or share any seed.

Bots - play Versus, co-op Campaign or co-op Survival offline with one to three bots, or fill empty seats in your lobby.

Revives - hold E beside a downed teammate for three seconds to get them back up.

Leaderboards for the Daily Breach, the fastest Campaign victory and the highest Breach Level, and a friends filter on every board.

Codex - 26 research files on every hostile and on what happened to the facility.

Controller support, menus included, with aim assist and rumble.

Exit Game on the title, pause and results screens. Thanks to the review that asked for a leave button!

Every enemy wind-up has its own sound, heard from the direction of the enemy, and Survival, Versus, boss fights and the Director have music of their own.

Hosting opens a lobby: see who has joined, chat, and start the game when ready. The results screen can take everyone back to the lobby.

Versus has its own courtyard arena, with a central block and walls that open on every side.

Versus guns are pickups: everyone starts with the pistol, and the other nine guns wait around the map, the heaviest in the gate alcoves. A taken gun returns after 12 seconds, or 20 for the heavy ones.

Volume sliders for sound effects and music in Settings, plus Mute All.

Menu sounds for moving, confirming and refused actions.

Co-op Campaign for up to four players.

Versus: a free-for-all for up to four players in the arena. First to 15 frags, or the most after five minutes, wins.

Multiplayer chat: press T (or Enter during play).

Standings: hold Q for kills, damage and score in co-op, or frags and deaths in Versus.

Each leaderboard opens in full with View All.

While down in co-op, you watch a standing teammate through their eyes, with their gun and its sound. Click, Space or D switches to the next teammate, and A goes back.

A soft chime repeats every 3 seconds while your loot pick is holding up the team, and every 5 seconds on the host's results screen while teammates wait.

Co-op Survival for up to four players: host a public game, join one from the list, or join a friend through Steam.

The team shares XP Molecules and levels up together, and everyone picks their own loot.

Downed players come back at half health when the next wave starts; the run ends when everyone is down.

Every pickup shows a short notice in the lower left.

A 10 second intermission after each Campaign round; press F to move on early.

Survival now holds out in one sealed octagonal arena with four gates, instead of new floors.

Separate Campaign and Survival leaderboards: best round and best wave.

Survival mode with endless waves and a weapon or upgrade pick every time you level up.

Eight achievements, including a campaign win using only the starting pistol and maxed permanent upgrades.

Separate Survival best-wave and best-level records.

Twelve detailed wall artworks, including scanners, conduit banks, gauges and damaged panels.

Enemy health bars and floating damage numbers, with distinct critical hits.

A level-up callout showing the health and damage gained.

Personal best round shown during combat and on run results.

Global highest-round leaderboard that retains each player’s record.

Eleven achievements for combat, progression, flawless clears and victory.