Is Rainbow Slime breedable?

Yes. 17 parent pairs produce Rainbow Slime.

Where does Rainbow Slime sit in the breeding order?

Its CombiRank is 3100, and on a range that runs 20 to 3,100 that places Rainbow Slime in the upper third. Ranks are the only thing that decides whether a pair works: the two parents average to floor((rank A + rank B + 1) / 2), and the breedable Pal nearest that average is what hatches.

Is Rainbow Slime worth keeping for base work?

Its strongest job is transporting at level 1, and it is a standard Pal at Paldeck #10006.

Does a cake change what Rainbow Slime eggs hatch into?

No, and 3100 is the number that matters here rather than the recipe: the pair you choose decides the child before the egg exists, and no ordinary Cake turns Rainbow Slime into something else. The advanced ones change what comes with the hatch for Rainbow Slime: egg count, stat growth, passive inheritance, and two of them improve the mutation roll.

How to breed Rainbow Slime

17 verified parent combinations
Breeding rank 3100
Paldeck #10006

Rainbow Slime stats

Best early-game combo

Green Slime + Cave Bat uses the two most common parents on this list, so it is usually the cheapest route to Rainbow Slime.

Breeding tree

Rainbow Slime rank 3100

Showing 6 of 17 routes. The table below lists the rest.

All 17 parent combinations

Of the 17 pairs that produce Rainbow Slime, filter this list down to the ones you can make right now or sort it to find the cheapest route.

Pairs I can make (0) 17 shown

All 17 parent pairs are listed below.

All parent combinations that produce Rainbow Slime
Parent A	Parent B	Type
Green Slime	Rainbow Slime	Special combo
Green Slime	Cave Bat	Special combo
Green Slime	Illuminant Bat	Special combo
Blue Slime	Rainbow Slime	Special combo
Blue Slime	Cave Bat	Special combo
Blue Slime	Illuminant Bat	Special combo
Rainbow Slime	Red Slime	Special combo
Red Slime	Cave Bat	Special combo
Red Slime	Illuminant Bat	Special combo
Purple Slime	Rainbow Slime	Special combo
Illuminant Slime	Rainbow Slime	Special combo
Illuminant Slime	Cave Bat	Special combo
Illuminant Slime	Illuminant Bat	Special combo
Rainbow Slime	Enchanted Sword	Special combo
Rainbow Slime	Cave Bat	Special combo
Rainbow Slime	Illuminant Bat	Special combo
Rainbow Slime	Rainbow Slime	Breeds true
No pairs match these filters.

Rainbow Slime breeding steps

1. Build a Breeding Farm

A Breeding Farm with Cake in a nearby chest is the whole setup. The 17 parent pairs on this page are the input: check them against your Palbox before you spend Cake on a wild Pal.
2. Assign the two parents

Assign Green Slime and Cave Bat, one of each gender. The pairing is what matters rather than which side each of them sits on: swap them and Rainbow Slime still hatches, unless the pair happens to be the one gendered special combination.
3. Collect and incubate the egg

Collect the egg and incubate it: a Common Egg is what Rainbow Slime arrives in. Nothing about the Common Egg needs tuning, so leave it running and go set up the next pair for Rainbow Slime.
4. Repeat for passives

Keep the pair in the farm and the passives reroll from egg to egg; Rainbow Slime keeps hatching, only the passives and the stat growth change.

Rainbow Slime breeding FAQ

Is Rainbow Slime breedable?: Yes. 17 parent pairs produce Rainbow Slime, and Green Slime + Cave Bat is one of the easiest.
Where does Rainbow Slime sit in the breeding order?: Its CombiRank is 3100, and on a range that runs 20 to 3,100 that places Rainbow Slime in the upper third. Ranks are the only thing that decides whether a pair works: the two parents average to floor((rank A + rank B + 1) / 2), and the breedable Pal nearest that average is what hatches.
Is Rainbow Slime worth keeping for base work?: Its strongest job is transporting at level 1, and it is a standard Pal at Paldeck #10006.
Does a cake change what Rainbow Slime eggs hatch into?: No, and 3100 is the number that matters here rather than the recipe: the pair you choose decides the child before the egg exists, and no ordinary Cake turns Rainbow Slime into something else. The advanced ones change what comes with the hatch for Rainbow Slime: egg count, stat growth, passive inheritance, and two of them improve the mutation roll.