Updated 2026-06-18: zone-by-zone farming guide
Slime RNG Worlds Guide
Every world and zone in Slime RNG covered: spawn tables, unlock requirements, biome-specific slimes, and the best farming approach for each area. The zones listed reflect the June 2026 Void Expansion state of the game.
Quick answer — which world should I be in?
If your priority is Legendary slimes: farm Void World (post-June 2026 expansion) for the highest Legendary density, or Graveyard World if Void is locked. For Mythic and Exotic slimes: the Inverted World has the highest Exotic spawn weight once unlocked. For early-game coin farming: start in Grassy Plains or Fiery Volcano, both have reliable Common-through-Rare spawns that build income without needing an unlock milestone.
All Slime RNG worlds at a glance
| World | Unlock condition | Best slime rarities | Biome-exclusive slimes |
|---|---|---|---|
| Grassy Plains | Default (no unlock) | Common, Uncommon, Rare | Basic Slime, Leafy Slime, Rainbow Slime |
| Icy Tundra | Collect 25 Common slimes | Uncommon, Rare, Epic | Ice Slime, Crystal Slime |
| Fiery Volcano | Collect 50 Uncommon slimes | Rare, Epic, Legendary | Fire Slime, Lava Slime, Ember Slime |
| Graveyard World | Reach Rebirth 1 | Epic, Legendary, Mythic | Ghost Slime, Bone Slime, Cursed Slime, Void Slime (shared) |
| Inverted World | Complete Inverted Slime chain | Mythic, Exotic, Inverted | Inverted Slime, Mirror Slime |
| Void World | Collect 500+ unique slimes | Legendary, Mythic, Exotic | Void Slime (exclusive drop in new zones), Shadow Slime |
Unlock conditions are community-verified from Discord reports and in-game milestones as of June 2026. Stouts Studio does not publish exact unlock thresholds in official patch notes.
Rarity spawn weights by world
Each world biases its spawn table toward different rarity ranges. The weights below are community-modeled from session data, they represent relative probability of each rarity appearing in that zone without luck boosts. Higher luck boosts all worlds proportionally but does not change the biome-exclusive rules.
| World | Common | Uncommon | Rare | Epic | Legendary | Mythic+ |
|---|---|---|---|---|---|---|
| Grassy Plains | 60% | 30% | 8% | 1.8% | 0.18% | 0.02% |
| Icy Tundra | 40% | 38% | 15% | 5.5% | 1.2% | 0.3% |
| Fiery Volcano | 20% | 30% | 28% | 15% | 5.8% | 1.2% |
| Graveyard World | 5% | 10% | 25% | 30% | 24% | 6% |
| Inverted World | 1% | 4% | 10% | 20% | 30% | 35% |
| Void World | 2% | 5% | 15% | 25% | 38% | 15% |
Percentages are modeled from community session reports, not official Stouts Studio data. They represent base spawn probability per roll, actual rates with luck boosts multiply these base weights. Use the luck calculator to model your personal setup on top of these biome weights.
Farming strategy by world
Grassy Plains
Default starting zone. Best for: Common and Uncommon collection targets, early coin farming, completing the beginner 25-slime milestone to unlock Icy Tundra. No rebirth or unlock required. Fire Slime and Ice Slime do not spawn here, move to Fiery Volcano or Icy Tundra as soon as you hit the 25 Common milestone.
Icy Tundra
Second zone. Unlocks at 25 Common slimes collected. Ice Slime is exclusive here, if you need it for income or a crafting recipe, Icy Tundra is the only farming option. Epic spawns are noticeably higher than Grassy Plains, making this a solid transition zone between beginner and mid-game.
Fiery Volcano
Third zone. Unlocks at 50 Uncommon slimes collected. Fire Slime exclusive spawn, the best early-game income slime. Rare and Epic density is higher than Tundra. If your goal is getting Fire Slime for the coins-per-minute boost before the first rebirth, farm here until you have one and a basic luck setup stable.
Graveyard World
Unlocks after Rebirth 1. Dramatically higher Epic and Legendary density than the first three zones. The Graveyard Rework in Q1 2026 added three new crafting recipes with Graveyard-exclusive ingredient slimes, see the graveyard recipes page for the complete list. Void Slime also appears here at reduced rates compared to Void World.
Inverted World
Unlocks after completing the full Inverted Slime unlock chain. Highest Mythic and Exotic density in the game. The Inverted Slime itself (1 in 100,000,000 base odds) only spawns here. If you are targeting Exotic or Inverted rarities, this is the mandatory zone, no other world has the spawn weights for these tiers. See the Inverted Slime guide for the complete unlock chain walkthrough.
Void World
Unlocks at 500+ unique slimes collected. Added in the Q3 2025 update and expanded in June 2026 with two new hidden spawn pockets. Highest Legendary density of any zone. Shadow Slime and the Void Slime's highest-rate spawn nodes are exclusive to this world. Recommended for mid-to-late Rebirth accounts targeting Legendary and Void Slime farming.
Recommended world unlock order
The standard progression route that minimizes time spent in under-density zones:
- Grassy Plains (default), Farm to 25 Common slimes. Use any codes (TEST, GULLIBLE) here. Target: unlock Icy Tundra.
- Icy Tundra, Farm to 50 Uncommon slimes + get Ice Slime for income. Target: unlock Fiery Volcano.
- Fiery Volcano, Get Fire Slime (income anchor) + reach Rebirth 1 coin milestone. Target: unlock Graveyard World.
- Graveyard World, Primary Epic/Legendary farming zone until Inverted chain complete. Target: complete Inverted Slime chain.
- Inverted World, Highest Mythic+ zone. Farm Exotic and Inverted targets here. Target: collect 500 unique slimes for Void unlock.
- Void World, Best Legendary zone (post-June 2026). Split time here and Inverted depending on target rarity.
The beginner guide covers the first 3 zones in more detail. The rebirth guide helps time the Rebirth 1 transition optimally. To see exactly which zone earns the most coins per hour for your specific rebirth count and play mode, use the world grind optimizer.
FAQ
How many worlds are in Slime RNG?
Slime RNG launched with 5 base worlds and has expanded through updates. As of June 2026, the game includes the Grassy Plains, Icy Tundra, Fiery Volcano, Graveyard, Inverted World, and Void World, 6 named zones with distinct spawn tables and unlock conditions.
Which world is best for Legendary farming?
The Void World (added Q2 2026) has the highest Legendary spawn concentration after the June 2026 expansion. For players who have not unlocked Void World yet, the Graveyard World has the second-best Legendary density.
Do different worlds have different slime drop rates?
Yes. Each world has its own spawn table with different rarity weights. Biome-exclusive slimes only appear in their home world, farming in the wrong biome means 0% chance of getting biome-specific slimes regardless of luck boosts.
How do I unlock new worlds?
World unlock conditions vary by zone. Most require reaching a coin or slime collection milestone. The Inverted World specifically requires completing the Inverted Slime unlock chain. The Void World unlocks after reaching a specific total slime count milestone.
Now you know every Slime RNG world and its farming potential - next steps
The zone optimizer uses your rebirth count, luck, and play mode to give a move-or-park verdict for your current world.
Project your income after moving to the next zoneThe coins calculator adds your slime loadout to see how coins per hour changes once you reach the new zone.
Decide whether a rebirth or a zone move comes firstThe rebirth ROI calculator weighs your farming rate and coin stack to tell you which upgrade is worth doing next.