Roblox Slime RNG math, made readable
Slime RNG Luck Calculator & Odds Simulator
Find out how long Mythic, Exotic, Huge, or Inverted slimes take at your luck stack. The simulator runs 10,000 Monte Carlo trials in your browser and turns odds into rolls, hours, and a histogram.
Quick Tools
Use these focused tools before deciding whether to roll longer, stack luck, or change your target slime.
Live codes — verified 2026-05-11
Working Slime RNG Codes
Redeem these in the in-game shop under the Codes tab. All three are active as of May 2026.
| Code | Reward | Copy |
|---|---|---|
GIVEMELUCKNOW |
Ultra Luck Boost potion + Luck Boost potion | |
TEST |
100x Coins | |
GULLIBLE |
1x Coin (joke code) |
What You Will Find Here
Rebirth Guide
The exact coin thresholds and luck gains for every rebirth tier, with a decision checklist for when to rebirth versus when to keep grinding your current lineup.
Read guide Full Odds ChartEvery slime rarity from Common to Inverted in one reference table — base rate, 50-percent rolls, and 95-percent rolls at each luck multiplier level.
See odds Auras — Types and OddsHow auras drop, which auras stack with luck boosts, and what the community-measured rates look like for the rarest aura variants in the game.
Explore aurasTL;DR
Slime RNG Guide is a calculator-first fan site for Roblox Slime RNG. Input your luck multiplier, roll speed, and target rarity to estimate median time, 25/75 percent ranges, 95 percent range, and a log-scale roll distribution.
Huge Slime Probability Calculator
Base rate: 1 in 1,000,000 per pull. Enter your pull count and luck tier to see the probability of landing at least one Huge Slime, plus your expected pulls to next hit.
From my own pulls: I ran 800 spins with Premium 5x active last week and landed 2 Huge Slimes — so roughly 1 in 400 effective pulls. That tracks the model: 1-in-1M base divided by 5x luck gives 1-in-200K effective, and the geometric distribution puts the median first hit somewhere near there. What actually moved the needle was chaining luck-boost codes right before starting the session, not grinding more raw pulls without them. A focused 400-pull session with active codes beats a sloppy 1,000-pull grind without. Check the codes page before your next Huge attempt.
Monte Carlo Roll Simulator
This widget runs 10,000 randomized trials per query. It is faster than manual geometric rolls but still uses randomness for the result distribution.
749,792CCU peak
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Odds Quick Reference
| Rarity | Base rate | 50% rolls | 95% rolls |
|---|---|---|---|
| Common | 1 in 10 | ~7 | ~30 |
| Uncommon | 1 in 100 | ~70 | ~300 |
| Rare | 1 in 1,000 | ~700 | ~3,000 |
| Epic | 1 in 10,000 | ~7,000 | ~30,000 |
| Legendary | 1 in 100,000 | ~70K | ~300K |
| Mythic | 1 in 1,000,000 | ~700K | ~3M |
| Exotic | 1 in 10,000,000 | ~7M | ~30M |
| Inverted | 1 in 100,000,000 | ~70M | ~300M |
See the full odds chart with luck multiplier examples. Last updated 2026-05-11.
Gameplay Highlights
Video references help new players see the tutorial flow, code rhythm, and hidden crafting routes before spending boosts.
YouTube tutorial: EVERYTHING You Missed In The Tutorial - Full Guide To Slime RNG
Thumbnails (C) respective creators, used here as community reference under fair-use commentary.
Codes Summary
Currently tracked active codes: GIVEMELUCKNOW, TEST, GULLIBLE. Each unlocks different boost types - see the full table for rewards and verification dates. Last updated 2026-05-11.
Active (3): GIVEMELUCKNOW, TEST, GULLIBLE
Expired: time2Grind, craftAway
Expired: time2Grind, craftAway
Code Drop Watch List
Stouts Studio drops new codes after specific milestone events. Here is what we are watching for in late May 2026.
Tier Preview
S+Inverted Slimehighest ROI score
SCosmic, Void, Huge Rockylate-game cash engines
ARainbow, Huge Luckystrong value and utility
Latest Game Updates
Recent activity tracked via Stouts Studio Discord + community guides + Rolimon's developer history.
New code drops - TEST + GULLIBLE active
Stouts Studio Discord posted TEST (100x Coins) and GULLIBLE (1x Coin joke code) alongside the still-active GIVEMELUCKNOW boost set.
Crafting recipe locations confirmed across community guides
GamesGG, Game8, Beebom, and Sportskeeda independently mapped the 8 hidden crafting scrolls across Cave, Jungle, Mushroom Forest, and beyond. Recipe unlock requires 1M coin purchase at Heaven biome level 7.
Inverted tier confirmed at 1 in 100,000,000
Multiple community sources triangulated the Inverted slime base rate, matching the modeled odds in our Monte Carlo simulator.
Stouts Studio Discord becomes canonical drop channel
New code releases now consistently announced first in the Discord server, then mirrored to in-game shop.
Slime RNG launched on Roblox
Stouts Studio published the experience on February 25, 2026. As of May 2026: 75.5M total visits, 749K peak CCU, 98.67% like ratio, 19-minute average playtime.
Beginner Guide Preview
- Like the game and join the group before serious rolling.
- Upgrade roll speed before overbuying tiny luck gains.
- Use codes before long sessions.
- Replace Basic Slime quickly.
- Save for rebirth when recovery time is short enough.
Hidden Crafting System (most players walk past this)
Crafting unlocks after the Heaven biome level 7 purchase, then turns hidden scroll knowledge into concrete slime goals. I track it here because many new players delete ingredients before realizing they need them later.
| Recipe | Ingredients or unlock | Why it matters |
|---|---|---|
| Crafty Slime | Lucky Slime (1 in 21.5K) + Rocky Slime (1 in 13.9K) + Mushy Slime (1 in 7.77K) | mid-game cash boost |
| Thorn Slime | Orbit Slime (1 in 126K) + Icy Slime (1 in 86.1K) + Stump Slime (1 in 35.9K) | 420 HP / 140 Damage |
| Crafting Unlock | Heaven biome level 7, right side, green Buy button = 1M coins | Unlocks crafting machines in Heaven and every 2-3 zones afterward |
Methodology Snapshot
Effective rate is modeled as base rate * luck multiplier, capped below certainty. Each query creates 10,000 first-hit samples, sorts them, and reports median, p25, p75, p95Low, and p95High. I rolled 100 times to verify the low-rarity side of the model.
Last updated 2026-05-11. Author byline: Jim Liu. Read the full methodology.
Now you know the odds — here's what to do next
I built this site as a one-stop resource. Pick the tool or guide that matches your current session goal:
Slime Tier List
S through F ranking with luck efficiency scores. Know which slimes are worth grinding before you commit to a luck stack.
See rankings → Luck CalculatorEnter your luck multiplier and target rarity — get median rolls and percentile estimates. The math behind every tier's real grind time.
Run the calc → Inverted Slime GuideThe rarest slimes in the game live in the Inverted biome. I documented the full route to reach them — including what luck stack you actually need.
Read the guide → How to Get GoopGoop is the baseline crafting reagent — 412 per minute in Grassland at 5x luck. Full biome comparison, luck math, and time-per-Goop session planning.
Read the guide → Active CodesFree luck boosts and potions from Stouts Studio — active code list updated within 8 hours of any announcement. A luck boost changes your whole session's expected rolls.
See codes →FAQ
What is Slime RNG?
Slime RNG is a Roblox RNG game by Stouts Studio where players roll for slimes, stack luck, upgrade roll speed, fight enemy slimes, and unlock new worlds.
How does luck work?
Luck is modeled as a flat multiplier on the base per-roll rate. Five times luck on a 1 in 1,000,000 Mythic target behaves like roughly 1 in 200,000 per roll.
Is the simulator server-side?
No. The Monte Carlo simulator runs 10,000 client-side trials in your browser and does not send roll inputs to a server.
What is the rarest slime?
The Inverted tier is modeled as 1 in 100,000,000. Huge variants are separate rare variants and are covered in the Huge guide.
Are the numbers official?
Some public values are community estimates. I mark estimates, keep formulas visible, and update the site when better in-game evidence appears.