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Astro Colosseum World 4 - IdleOn

September 24, 2025

Astro Colosseum is the World 4 Hyperion Nebula Colosseum that allows you to defeat waves of monsters for Treasure Chests that hold useful rewards. Colosseum runs are a great way to boost your resources when you first reach a world, so check out the drop tables below.

The Astro Colosseum is located in Hyperion Nebula / TV Outpost (the second map of World 4).

It costs 6 Tickets to enter the Chillsnap Colosseum. Colosseum Tickets work across all Colosseum so ones you earn from World 1 and World 2 also work for World 3.

Unlike previous Colosseums, you do not get daily tickets for this one. Instead, you'll need to use tickets from previous Colosseums.

Astro Colosseum Waves

You have 5 minutes to complete all waves for the Colosseum. There are a total of 15 waves to defeat.

Wave Monsters
Wave 1 Purp Mushroom x8
Wave 2 TV x8
Wave 3 Purp Mushroom x4 TV x8
Wave 4 Donut x10
Wave 5 TV x10 Donut x10 Demon Genie x15
Wave 6 Flying Worm x12
Wave 7 Soda Can x14 Flying Worm x8
Wave 8 Gelatinous Cuboid x16
Wave 9 Choccie x12 Soda Can x8 Flying Worm x6
Wave 10 Biggole Wurm x20
Wave 11 Clammie x10
Wave 12 Octodar x17
Wave 13 Flombeige x13 Clammie x6
Wave 14 Stilted Seeker x8
Wave 15 Flombeige x13 Octodar x6 Stilted Seeker x20 Mutated Mush x1

Astro Colosseum Treasure Chests

Depending on your final Colosseum score, you'll get a number of Treasure Chests that give items when opened. Below you can find the items you can potentially get inside each Treasure Chest.

A score of 5,850,000 gets you all the Treasure Chests.

Score Chest Notes
0 Bronze ChestBronze Chest  
125,000 Bronze ChestBronze Chest  
325,000 Silver Chest Silver Chest  
650,000 Gold Chest Gold Chest Must complete all 15 waves
2,600,000 Gold Chest Gold Chest Must complete all 15 waves
4,000,000 Bronze ChestBronze Chest  
5,200,000 Silver Chest Silver Chest  
5,850,000 Gold Chest Gold Chest Must complete all 15 waves

Bronze Chest Drop Table

Below you can find all the items that drop from the Bronze Chest.

Item Drop Rate Quantity
COIN.png
Coins
1 in 1 800000
1 in 2 250
1 in 2 200
1 in 2 8
1 in 3 100
1 in 5 3

Gem

1 in 8 1
1 in 25 1
1 in 40 1
1 in 50 1
1 in 67 1
1 in 167 1
1 in 238 3
1 in 333 1
1 in 1,111 1
1 in 1,852 1
1 in 3,704 1
1 in 4,348 1
1 in 555,556 1

Silver Chest Drop Table

Below you can find all the items that drop from the Silver Chest.

Item Drop Rate Quantity
COIN.png
Coins
1 in 1 1500000
1 in 2 1
1 in 2 1000
1 in 2 750
1 in 2 8
1 in 3 600
1 in 3 1500

Gem

1 in 4 1
1 in 5 3
1 in 7 50
1 in 14 1
1 in 25 1
1 in 40 1
1 in 83 1
1 in 238 3
1 in 333 1
1 in 1,111 1
1 in 1,852 1
1 in 6,667 1
1 in 555,556 1

Gold Chest Drop Table

Below you can find all the items that drop from the Gold Chest.

Item Drop Rate Quantity
COIN.png
Coins
1 in 1 4000000

Gem

1 in 2 1
1 in 2 8
1 in 5 3
1 in 20 150
1 in 25 1
1 in 33 2000
1 in 40 2
1 in 40 1
1 in 50 1500
1 in 238 3
1 in 333 1
1 in 1,111 1
1 in 1,852 1
1 in 5,556 1
1 in 20,000 1
1 in 555,556 1

Astro Achievements

The following W4 achievements are available for participating in the Astro Colosseum.

Icon Achievement Description Rewards Steam Exclusive
TaskAchD26.png Zero G Scorin' Get a Score of 10,000,000 or more in the Astro Colosseum
  • +5% Cash from Monsters
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