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Monster Outbreak

Monster Outbreak

The King's dimensional orb has malfunctioned, bringing hordes of monsters into the Kingdom. Defend your safeground against the monsters by gathering resources, building defenses, upgrading your arsenal, and surviving long enough to find the source of monsters and destroy it.

Released Oct 3, 2022 Developer GameMunchers Publisher indie.io Platforms Windows SurvivalCo-opMultiplayerHack and SlashCrafting
View on Steam ↗ $14.99 (US · as of 2026-09-28)

What players say

Steam review score and the most-helpful voices, which may include critical ones. Score via Steam as of 2026-09-28.

66.3%positive101 reviews
Recommended · 9 found this helpful

“Super close call. The mixed reviews are pretty accurate. All the bad: First off, you can't save in the game, and the games are super long, so I left my computer running for about 4 days straight. I haven't played for 120+ hours; I've probably played around 10, but my computer…”

— a player, Steam review · 123 hrs played
Recommended · 22 found this helpful

“I don't understand the downpour of negative comments from people that are shown to have played this game for around an hour or even less. It's obvious that they haven't even gotten to the parts beyond tutorial level combat to have experience what it is about. And the game is…”

— a player, Steam review · 37 hrs played
Not recommended · 146 found this helpful

“So, the game has a lot of charm, but ultimately I feel it is immediately overshadowed by how clunky and tedious everything is in the game. No ability to change keybindings has also always been a head-scratcher for me, but I'm not a game dev, so I don't know how difficult that…”

— a player, Steam review · 1 hrs played
Read more reviews ↗

Achievement stats

Global completion rates across all Steam players — a data view of how far people actually get. Source: Steam official stats · as of 2026-09-28.

40achievements
2.3%median completion
0.5%rarest: Veteran
84.7% of players 57.8% of players 48.1% of players 30.6% of players 28.0% of players 23.7% of players 19.1% of players 15.0% of players 11.1% of players 10.6% of players 9.1% of players 8.2% of players 7.5% of players 7.3% of players 6.1% of players 6.0% of players 4.5% of players 3.0% of players 2.5% of players 2.4% of players 2.3% of players 2.1% of players 2.1% of players 2.0% of players 2.0% of players 1.2% of players 1.1% of players 1.0% of players 1.0% of players 1.0% of players 0.8% of players 0.8% of players 0.8% of players 0.8% of players 0.7% of players 0.7% of players 0.6% of players 0.6% of players 0.5% of players 0.5% of players 84.7% 0% most earned rarest
Almost everyone has
84.7%Heated — Collect a fire stone
57.8%Beginner Slayer — Kill 100 monsters
48.1%Dethroned — Kill the Slime King
Rarest badges of honor
0.5%Veteran — Reach wave 100 on any map
0.5%Giant Assassin — Kill 500 devourer giants
0.6%Bird Hunter — Kill 500 dimensional harpies

Latest official news

Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.

Jun 25, 2026
Monster Outbreak: 70% Off in the Steam Summer Sale!

Monster Outbreak is 70% off in the Steam Summer Sale, June 25 to July 9. Grab your copy and check out other great indie games on sale during the Summer Sale to add to your collection. https://store.st

Apr 15, 2024
Monster Outbreak is part of Freedom Games Publisher Sale!

Hi everyone - if you were thinking about getting the game, now is a great time to do so. The game will be 67% off from April 15th through the 22nd! Make sure to check out Freedom Games Publisher Sale

Dec 21, 2023
Monster Outbreak is part of the Steam Winter Sale!

Hi everyone! If you were thinking about getting the game, now is a great time to do so as we are part of the Steam Winter Sale through our publisher Freedom Games! From December 21st until January 4th

Mar 01, 2023
Patch Notes 1.0.14

Hey everyone! We're continuing to work on any bugs you all have found and will continue updating as needed. If you're still having some connection issues, please message adambrosio on Steam or create

Jan 26, 2023
Patch Notes 1.0.13

Hey everyone! We're continuing to work on any bugs you all have found and will continue updating as needed. If you're still having some connection issues, please message adambrosio on Steam or create

Screenshots

Official Steam store screenshots — click any shot to enlarge.

Facts & details

From the Steam store record, snapshot 2026-09-28.

GenresAction, Adventure, Indie, RPG, Strategy
Player tagsSurvival · Co-op · Multiplayer · Hack and Slash · Crafting · Tower Defense · Base Building · Controller · Action · Arcade · Strategy · 2D (Steam store community voting)
FeaturesSingle-player · Multi-player · Co-op · Online Co-op · LAN Co-op · Shared/Split Screen Co-op · Shared/Split Screen · Steam Achievements
LanguagesEnglish * , French, German, Spanish - Spain, Japanese, Simplified Chinese, Korean, Portuguese - Brazil *
ControllerFull support
Achievements40
Official sitehttps://gamemunchers.com/monster-outbreak/
Minimum system requirements (PC)

Minimum: OS: Windows 10 Processor: Dual core 2.0Ghz+ Memory: 4 GB RAM Graphics: Dedicated graphics card Storage: 3 GB available space