Critical Mass
new_releases
New — just published
A fast multiplayer arena game where you eat, grow, split, and try to become the biggest cell on the map.
favorite7favorites
thumb_up8upvotes
thumb_down5downvotes
hard_drive
23 MB
folder
389 files
build
Engine v28
bolt
Updated recently
About This Package
Eat Small. Grow Huge.
Critical Mass is an online cell survival game built around one simple rule: bigger cells eat smaller cells.
You start each life near the bottom of the food chain. Collect pellets to gain mass, chase players small enough to consume, and stay away from anything that can consume you. Larger cells are powerful but slow, so getting bigger does not automatically make you safe.
There is no round timer. Your life continues until every one of your cells has been eaten.
The Arena
Move with your mouse or controller stick and your cells will follow. Small cells move quickly. Large cells take longer to turn and accelerate.
The basic controls are easy to learn, but using them at the right time is what keeps you alive.
- Consume pellets and players: Food provides steady growth, while consuming another player can completely change your position on the leaderboard.
- Split your cells: Launch half of your mass forward to catch prey or escape danger. You can control up to 16 cells at once, but every split creates another vulnerable piece of you.
- Eject mass: Give mass to another player, use it as bait, or fire it into a virus.
- Use viruses: Large cells that consume a virus burst into smaller pieces. Feeding a virus enough ejected mass causes it to divide and launch another virus across the arena.
- Merge again: Split cells can eventually combine back into a larger cell if you manage to keep them alive.
Public and Private Matches
Public matchmaking places you into an active lobby or creates a new one when necessary. Lobbies support up to 64 players.
You can also create a private match and share its six-character lobby code with friends.
Private hosts can:
- Enable or disable bots
- Choose 0.5x, 1x, 2x, or 3x pellet density
- Invite players with a lobby code
- View everyone currently connected before entering the arena
Persistent Progression
Your current size disappears when a run ends, but your profile progress remains.
Standard matches award experience and coins. Your profile tracks:
- Highest mass reached
- Longest survival time
- Total pellets consumed
- Total players consumed
- Matches played
- Wins
- Lifetime survival time
There are 36 achievements covering basic milestones, enormous runs, player eliminations, split challenges, pacifist runs, daily rewards, rivalries, and cosmetic collection.
Daily rewards increase over a seven-day streak. Achievement rewards and match earnings provide coins that can be spent in the skin shop.
If the same player repeatedly ends your runs, they can become your Nemesis. Their name is saved to your profile, highlighted in the kill feed, and tracked until you defeat them.
Global leaderboards are available for:
- Pellets consumed
- Biggest mass
- Players consumed
- Longest survival
- Matches played
- Mass ejected
Colors, Skins, and Custom Cells
Choose from 10 free cell colors at any time. Colors are separate from skins, so you never need to purchase a basic color change.
The cosmetic collection contains 39 choices, including the Eight Ball, Penguin Pop, Rubber Duck, Baby Dino, Black Hole, Radioactive Ladybug, Arcade Cabinet, Dragon, Ghost Skull, Plague Doctor, and many more.
Skins are cosmetic. They do not provide extra speed, mass, damage, or other gameplay advantages.
The World Flag skin includes a searchable collection of 255 countries and territories.
The Open Canvas skin lets you place a direct image URL inside your cell. Images are automatically cropped to fit the circular shape. Custom images are disabled by default, and every player can choose whether they want custom images to appear.
Controls and Settings
Critical Mass supports mouse and keyboard as well as controller play.
- Mouse or left stick to move
- Mouse wheel or controller bumpers to zoom
- Space or controller A to split
- W or controller X to eject mass
- Enter to open match chat
- Escape or the controller menu button to pause
Settings include adjustable UI scale, master volume, arena grid visibility, exact mass display, reduced skin motion, high-contrast interface edges, and custom image visibility.
Enter the arena, choose your fights, and see how big you can get.
newspaper Latest News
Media (9)
218
Total Users
274
Total Sessions
3.8 days
Total Playtime
Global Statistics
82
cosmetic_owned_aurora_v1
90
cosmetic_owned_baby_dino_v1
82
cosmetic_owned_black_hole_v1
82
cosmetic_owned_blue_fang_v1
82
cosmetic_owned_boombox_v1
82
cosmetic_owned_boxer_v1
85
cosmetic_owned_boxing_shrimp_v1
107
cosmetic_owned_candy_v1
68
cosmetic_owned_cherry_cyclops_v1
85
cosmetic_owned_coral_imp_v1
2.0K
cosmetic_owned_core_v1
88
cosmetic_owned_custom_v1
Positive
Negative
How this works: This chart tracks all anonymous thumbs up/down votes, not just the written reviews below. Playtime is permanently recorded at the exact moment the user casts their vote. Data is exactly as returned by the Facepunch API.
1m - 2m
1
2m - 4m
4
8m - 16m
3
32m - 1.1h
1
68.3h - 136.5h
1
Package ID:
spn.critical_mass
Created:
2026-07-17 08:00 UTC
Updated:
2026-07-18 01:41 UTC
Type:
game
Public:
Yes
Version:
311813
files:
389
Size:
23.4 MB
Engine Version:
28
Asset Version ID:
311813
Version Created:
2026-07-18 01:41 UTC
Hash:
1784338882
Manifest: Open manifest
Multiplayer:
Yes
Versus:
Yes
Co-op:
No
Max Players:
64
Min Players:
1
Tick Rate:
25
Game Network Type:
Multiplayer
Map Select:
Unrestricted
Map List:
Rank Type:
None
Per Map Ranking:
false
Leaderboard Type:
None
Cs Proj Name:
Startup Scene:
scenes/minimal.scene
Launch Mode:
Normal
Resources:
/fonts/manrope/*
/textures/skins/*
/textures/flags/*
Game Settings:
Code Package References:
311813
Jul 18, 2026
Localization added
311779
Jul 17, 2026
Update 1.0.1
311264
Jul 16, 2026
Initial Release