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Idle Monster TD

Idle Monster TD

An endless Tower Defense game of epic Monsters vs evil War Machines. Unlock and upgrade tons of unique elemental Monsters (Water, Air, Earth, and Fire) to defend your home from an infinite swarm of robots. Strategize the most effective placement of Monsters to synergize their elemental abilities.

Released Jun 20, 2021 Developer Swell Games LLC Platforms Windows · Mac StrategyTower DefenseIdlerPixel GraphicsFantasy
View on Steam ↗ Free (US · as of 2026-07-26)

What players say

Steam review score and the most-helpful voices, which may include critical ones. Data as of 2026-05-20.

72.3%positive815 reviews
Recommended · 0 found this helpful

“very cool game, but just go play Summoner's Greed on mobile it's better”

— a player, Steam review · 0 hrs played
Recommended · 0 found this helpful

“o”

— a player, Steam review · 50 hrs played
Not recommended · 5 found this helpful

“[h1] Not tower game just pay-to-win[/h1] This is the simple story for new player, you leading a monster kingdom to defense evil human robot army, kind of reverse the typical story that other mmo. For the biggest problem in this game are limit the tower, greedy developer just…”

— a player, Steam review · 0 hrs played
Read more reviews ↗

Player activity

Monthly average concurrent players. Live count fetched 2026-07-24 01:08 UTC · history via SteamCharts.

23playing at last check
3524-hour peak
1,088all-time peak
0 500 1k 2021 2022 2023 2024 2025 2026 890 avg · Feb 2021

Achievement stats

Global completion rates across all Steam players — a data view of how far people actually get. Source: Steam official stats · as of 2026-07-25.

24achievements
8.6%median completion
2.2%rarest: Accomplished
49.1% of players 44.6% of players 37.2% of players 37.2% of players 25.6% of players 23.8% of players 21.4% of players 14.7% of players 14.1% of players 9.7% of players 8.9% of players 8.7% of players 8.6% of players 7.7% of players 5.8% of players 5.3% of players 5.2% of players 4.1% of players 2.9% of players 2.7% of players 2.6% of players 2.4% of players 2.3% of players 2.2% of players 49.1% 0% most earned rarest
Almost everyone has
49.1%Respected — Prestige 1 time.
44.6%Hunter — Unlock 10 unique monsters.
37.2%Mercenary — Defeat 10,000 enemies.
Rarest badges of honor
2.2%Accomplished — Have a monster reach Ascension level 15.
2.3%Master — Pass wave 5000.
2.4%Hoarder — Unlock all 44 unique monsters.

Price tracking

US-region pricing (USD), sampled twice daily by our own tracker since 2026-07-25. Steam prices vary by region — always confirm your local price on Steam.

Freecurrent · sampled 2026-07-26 08:39 UTC
Freelowest since tracking began2026-07-25

Latest official news

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

Oct 20, 2023
Patch v109 (October 20)

Bug Fixes: Critical bug fix that was causing enemies to stop spawning.

Oct 14, 2023
Update v108 (October 14)

- Fixed some unintended exploits. - Fixed bug related to massive exp gains at the extreme late-game. - Performance improvements.

Feb 23, 2022
Long Awaited Performance Patch and Bug Fixes (Feb 23, 2022)

Miscellaneous: Capped framerate on PC to 60 fps to improve performance (Steam/Kong). Added the new mandatory App Tracking Privacy prompt for iOS 14+ devices (iOS). Improved rewarded video ads experien

Apr 23, 2021
Update v1.44 (New Leaderboard Titles and Bug Fixes)

New Content: - New achievement for consecutive waves passed. - New leaderboard titles for consecutive waves passed and spell upgrade levels. - Added enemies killed and highest gold drop to the current

Apr 01, 2021
Challenge Map Rewards / Customizable Leaderboard Displays (Update v1.43)

New Content: Challenge Map rewards - earn a new resource by playing this minigame, and spend them on a whole new set of upgrades! Customizable leaderboard icons and titles - show some flair by unlocki

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Screenshots

Official Steam store screenshots — click any shot to enlarge.

Facts & details

From the Steam store record, snapshot 2026-05-20.

GenresCasual, Free To Play, Indie, Strategy
Player tagsStrategy · Tower Defense · Idler · Pixel Graphics · Fantasy · Combat · 2D · Cute · Resource Management · Time Management · Casual · Clicker (SteamSpy community voting)
FeaturesSingle-player · Steam Achievements · In-App Purchases · Stats
LanguagesEnglish
Achievements24
Estimated owners100,000 – 200,000 (SteamSpy)
Official sitehttps://idle-monster-td.fandom.com/wiki/Idle_Monster_TD_Wiki
Minimum system requirements (PC)

Minimum: OS *: Windows 7 and above Processor: 1Ghz or faster processor Memory: 2 GB RAM Storage: 200 MB available space