Slime RNG’s luck system is additive at the base, multiplicative on top. Every Like and Group reaction adds to your additive base. Everything else, passives, potions, gamepasses, rebirths, multiplies on top of that base. Below is every documented source.
Effective luck = (1 + sum of additive bonuses) × product of all multipliers.
Effective drop chance for a target slime with base rate 1/X at luck multiplier M is 1 / (X / M). Doubling your multiplier halves your expected hunt time. Quadrupling halves it again.
Rebirth tiers are mutually exclusive: only the highest rebirth level you’ve completed contributes its multiplier. You don’t add Rebirth 1 + Rebirth 2, Rebirth 2 replaces Rebirth 1’s multiplier.
| Source | Type | Effect | Duration | Verification |
|---|---|---|---|---|
| Lucky Slime Passive | passive | ×3 | — | multi source verified |
| Huge Lucky Passive | passive | ×3 | — | multi source verified |
| Luck Potion | temporary | ×2 | 3 min | multi source verified |
| Ultra Luck Potion | temporary | ×3 | 3 min | multi source verified |
| 2x Server Luck Gamepass | permanent mult | ×2 | — | multi source verified |
| Rebirth Level 1 | rebirth | ×1.82 | — | multi source verified |
| Rebirth Level 2 | rebirth | ×3.31 | — | multi source verified |
| Rebirth Level 3 | rebirth | ×6.03 | — | multi source verified |
| Rebirth Level 4 | rebirth | ×10.97 | — | multi source verified |
| Rebirth Level 5 | rebirth | ×19.97 | — | multi source verified |
| Rebirth Level 6 | rebirth | ×36.34 | — | multi source verified |
| Rebirth Level 7 | rebirth | ×66.15 | — | multi source verified |
| Big Dice | temporary | ×1.5 | 15 min | community reported |
| Apple | temporary | ×1.2 | 5 min | community reported |
| Like (+1) | permanent add | +1 | — | multi source verified |
| Group (+1) | permanent add | +1 | — | multi source verified |
| Friend in Server | permanent add | +0 | — | needs check |
Stack multiplicative sources before chasing any rare slime. A 2× gamepass plus a ×3 Ultra Luck Potion plus Huge Lucky’s ×3 aura plus Rebirth 1’s ×1.82 multiplier is roughly ×32.8 effective before any extra event boosts. The math compounds fast, but the calculator is still the source of truth for exact hunt windows.