Killroy's Slaughterhouse Guide - Skull Shop - IdleOn

Aleph

April 23, 2025

0

Killroy's Slaughterhouse is a mini-game found in IdleOn World 2 that you can play each week to earn Skulls that can be spent in the Skull Shop. The mini game consists of killing as many mobs as possible within the time limit to earn various rewards.

You can enter Killroy's Slaughterhouse by speaking to the pile of bones NPC and selecting the Enter Fight option.

How Killroy's Slaughterhouse Works

Each week there will be various rooms made available to you, each requiring a specific IdleOn class that can enter. The rooms contain a random mob to kill.

By default, you only start with one available room, but you can unlock others:

• Room 1 is unlocked by default
• Room 2 is unlocked by unlocking World 4
• Room 3 is unlocked by purchasing it from the Skull Shop (requires completing Rift 51)

Inside each Room, you'll need to defeat mobs within a time limit. Mobs have a chance to drop a Skull, which you can spend in the Skull Shop (see below).

At the end of each run, you'll then be given the option to upgrade to Killroy Slaughterhouse.

Rooms are reset each week at the IdleOn weekly reset time. You can also spend 400 Gems to reset the rooms.

Killroy Slaughterhouse Upgrades

You can add various upgrades to your Killroy Runs by completing runs. Each run will reward you with 1 point to spend on an upgrade.

Upgrades are unlocked after completing a certain amount of runs and the final 3 upgrades are unlocked from the Equinox Dream.

Upgrade	Description	Runs Unlock
	Add +1 second to timer	0
	Talent Drops	2
	1% Skull Bonus	16
	Faster Respawns	36 (Equinox Dream)
	Dungeon Drops	64 (Equinox Dream)
	Pearl Drops	100 (Equinox Dream)

Skull Shop

The Skull Shop is where you spend any skulls you have earned. 

The skulls you have collected will expire each week, so make sure you spend them as soon as possible!

Below are all the items you can buy at the Skull Shop:

Reward	Cost	Notes
1 HR Time Candy 2 HR Time Candy 4 HR Time Candy	5 Skulls	The candy given is random
Black Pearl	9 Skulls
Holy Pearl	10 Skulls
Crystal Mob Spawn	3 Skulls	Your next kill is 100% guaranteed to spawn a Crystal mob
Dungeon Loot Dice	6 Skulls
Arcade Balls	4 Skulls	Get +6 Arcade Balls to spend at the Arcade
Library Checkouts	8 Skulls	Get 2 Library Checkouts to at your VIP Library.
Refinery Cycle	1 Skull	Complete 1 Refinery Cycle automatically
Eggs	8 Skulls	Get 2 Pet Eggs
Cooking Ladle	5 Skulls	Get 3 Kitchen Ladles

The following items become available once you unlock Rift 51.

Reward	Cost	Notes
Unlock Room 3	4	1% Chance to permanently unlock the 3rd Killroy WeeklyFight!
Artifact Find Chance	9	Permanently boosts Artifact Find Chance!
Shovel Upgrade	5	Adds 1 nugget to your Shovel in Gaming, go dig it up!
Crop Evolution	6	Permanently boosts Crop Evolution Chance
Jade Gain	7	Permanently boosts Jade Gain!