How to play Slime Kingdom
You start as a speck of goo. Eat what is smaller than you, avoid what is bigger, and turn DNA into mutations that change how you fight.
The basics
- Grow. Swallow glowing nutrients and any creature smaller than you. Bigger slimes are slower but tougher.
- Collect DNA. Some creatures drop DNA. Fill the DNA bar to draft a mutation: pick one of three cards.
- Mutate. Mutations add abilities, passives and stat changes. Some pairs combine into hidden synergies.
- Push deeper. Each biome has a guardian. Defeat it to open a rift into the next biome, where everything is meaner and worth more.
Controls
| Scheme | Move | Abilities |
|---|---|---|
| Mouse steering | Your slime swims toward the cursor | Click or Space fires; right click, Q E R for others |
| Keyboard only | WASD or arrow keys | Space Q E R with auto-aim |
| Twin-stick | WASD, mouse aims | Click or Space fires at the cursor |
| Touch | Drag anywhere for a floating joystick | Tap the ability buttons; they aim automatically |
Esc or P pauses. Enter or R starts a new run.
The 5 biomes
1. Tide Pool
Warm shallows. Everything here is small, for now. Guardian: Tidal Aberrant.
2. Fungal Caves
Spore vents breathe in the dark. Leeches drop from the ceiling. Guardian: Mycelial Aberrant.
3. Thermal Vents
Geysers boil over without warning. Splitters thrive in the heat. Guardian: Magma Aberrant.
4. Frozen Abyss
Ice sheets steal your grip. Things wait under the frost. Guardian: Glacial Aberrant.
5. Aberrant Core
The living heart of the kingdom. It wants you inside it. Guardian: The Progenitor.
Creatures and enemies
Nutrient Bug
Harmless grazers. Some carry a speck of DNA. They scatter when something bigger approaches.
Thorn Crawler
Slow, armoured crawlers. Touching them hurts. They guard their patch rather than hunt.
Spore Beast
Puffballs that exhale slowing spore clouds when you come close.
Hunter Slime
Rival slimes. They stalk anything smaller and flee anything much larger.
Crystal Organism
Skittish mineral organisms packed with DNA. They run as soon as they notice you.
Lurker
An ambusher that buries itself and waits. Watch for ripples in the floor; it lunges when you pass too close.
Swarmling
Tiny biters that hunt in clouds. One is nothing; twelve will strip you. Area damage shreds them.
Shellback
Armoured from the front and slow to turn. Circle around and strike its soft back, or melt it with poison.
Siphon Leech
Darts in and clamps onto your membrane, draining you and slowing you down. Keep swimming hard or dash to shake it off; spikes and blasts pry it loose.
Splitter
Cut it and it becomes two. Each half splits again. Swallow it whole when you are big enough, or burst the whole family with area damage.
Bloater
A gas sac that drifts toward warmth, swells, then bursts, hurting everything nearby, its own kind included. Pop it from range or lure it into a crowd. Too acrid to swallow.
Mutagen Nest
A pulsing cyst of raw mutagen. Wardens wake when you come close; crack the core for a rare mutation.
Aberrant
A mutated apex predator. It sprays spines and its genome holds rare mutations.
Mutations
There are 38 mutations in six families: body, offense, movement, sensory, swarm and aberrant biology. 2 of them stay hidden until you discover how to unlock them, and 28 synergies wait to be found. See every mutation.
Tips
- Early on, eat everything you safely can. Size is your armour.
- Draft cards can be picked with the 1 2 3 keys, so you never lose your rhythm.
- Dash and blink are escape tools first. Save one charge for leeches and hunters.
- Area damage is the answer to swarmlings and splitters; range is the answer to bloaters.
- The Daily Specimen is the same for everyone, so you can learn the map and chase a better score.
Frequently asked questions
Is Slime Kingdom free?
Yes. Slime Kingdom is completely free to play in your browser. There are no purchases, no energy timers and nothing to unlock with money.
Do I need to download or sign up?
No. The game runs in any modern browser on desktop or mobile. You can play straight away as a guest; your progress is saved in your browser.
Can I play on my phone?
Yes. Slime Kingdom has touch controls with a virtual joystick and ability buttons, and works in portrait and landscape. You can also add it to your home screen.
Is there multiplayer?
Yes. Arena is an endless free-for-all where everyone grows by eating, and Battle Royale shrinks the map until one slime is left. Bots fill empty slots so matches start quickly.
How many mutations are there?
There are 38 mutations, 2 of them hidden until you meet their unlock condition, plus 28 secret synergies that trigger when two mutations combine. Most mutations can also be upgraded to a Mk II version.
What is the Daily Specimen?
Once a day everyone gets the same map and seed. Play it as often as you like and compare your best score on the daily leaderboard.
How do I beat the guardians?
Each biome is ruled by a guardian Aberrant that appears after a few minutes. Grow first, pick mutations that deal damage from range or over time, and keep moving. Beating a guardian opens a rift to the next, harder biome.