Completing the slime index in Slime RNG comes down to one repeatable system. You roll, you stack luck, and you push into new zones so rarer slimes can appear in your pool. Every entry you are missing is just a slime you have not rolled yet, so the real goal is raising your odds and rolling faster instead of hoping for blind luck.
Quick answer: Buy Auto Roll, max your roll speed, redeem every active luck code, join the Stouts Studio group for the +1 Luck bonus, then stack Super Luck and Ultra Luck upgrades while unlocking each of the 8 zones. Rebirth once you can farm Goop to lock in permanent multipliers, and keep rolling until each missing slime registers in your index.
How slimes are added to your collection
Slimes are the core collectibles you roll for, compare by rarity, level up, and equip. The first time you roll a new slime, it is recorded in your index. That means collection progress is tied directly to two things you control, which are how high your luck is and how many rolls you complete.
Higher luck shifts the probability toward rarer tiers, all the way up to Ethereal and Transcendent variants. Roll speed determines how many chances you get per minute. Pushing into later zones expands the pool of slimes that can drop, so a slime you cannot find early on may only become available after you unlock the right zone.
Set up the core roll loop first
Redeem active Slime RNG codes for luck
Codes are the fastest free way to boost luck before a rolling session. Enter them in the in-game code box, and the boost applies immediately so you can chase rarer slimes during the active window.
| Code | Reward |
|---|---|
| giveMeLuckNOW | Ultra Luck Boost + Luck Boost |
| 2muchluck | Ultra Luck Boost + Luck Boost |
| test | 100 Coins |
| gullible | 1 Coin (Easter egg) |
Note: Time your luck codes right before a long roll session so the boost overlaps with the most rolls possible.
Stack luck and use rebirth to reach rare slimes
Once your income stabilizes, the priority shifts from coins to luck. Accumulate 10M coins to unlock the Goop mechanic, then farm Goop to prepare for your first rebirth. Rebirth resets your run but grants permanent multipliers, which is the only way to push luck high enough for the rarest tiers.
After rebirthing, layer the Super Luck and Ultra Luck upgrades on top of your code boosts and group bonus. The hardest entries to complete are the Huge variants, which sit at roughly a 1-in-1,000,000 chance. Those only become realistic once your luck multipliers are fully stacked and you are rolling continuously, including offline loot that accumulates while you are away.
| Phase | Main collection action |
|---|---|
| Early game | Buy Auto Roll, max roll speed, unlock zones, focus Fin Slime for DPS |
| Mid game | Boost enemy count, reach 10M coins, farm Goop, join Stouts Studio group |
| Late game | Rebirth, stack Super and Ultra Luck, hunt Huge variants, push zones |
Use crafting recipes to round out the index
There are 8 crafting recipes hidden across the zones, and finding them lets you craft gear that supports faster collection. Recipe locations are spread out, including one in the Graveyard and one in Winder Wondarland (Zone 26). Pick them up as you unlock each zone so you are not backtracking later.
How to confirm a slime is collected
A slime counts toward completion the moment it first appears in your index after a roll. If an entry still shows as missing, it usually means one of three things. Your luck is not high enough for that rarity, you have not unlocked the zone where it appears, or you simply have not rolled enough attempts yet.
Keep feeding your slimes fruit for XP rather than hoarding it, prioritize DPS upgrades until income is steady, and only then pivot fully into luck. Stay in that loop, raise luck with every code, group bonus, and rebirth multiplier you can, and the remaining gaps in your collection close one roll at a time.
