IdleOn - The Incremental MMO

Developer: Lavaflame2
Released: Nov 6, 2025
Steam reviews: 77% of players recommend it, from 29,959 reviews — Steam calls that “Mostly Positive”
Tags: AdventureCasualIndie

On Linux, Steam Deck and Steam Machine

Proton: GoldDeck PlayableSteam Machine: PlayableSteamOS Compatible

This game runs great under Proton after tweaks, per ProtonDB reports (71 reports). Valve rates it Playable on Steam Deck.

Valve rates it Playable on Steam Machine. Valve marks it SteamOS Compatible.

Proton tier: ProtonDB · Deck rating: Valve · Steam Machine, Steam Frame and SteamOS ratings: Valve · Compare 2,053 games · Every game Valve rated for Steam Machine

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See this for every game you own. Paste a Steam profile: no account, nothing to install.

Where to buy

Steam

Buy on Steam

Compare elsewhere:GOG ↗Epic ↗

Price & availability

Best price now

$0.00

at Steam→

Real recorded prices & subscription data via IsThereAnyDeal.

What owning this involves

Needs another account · IdleOn AccountFrom the publisher's own store notice
No cloud saves · The store does not back this game's saves up — they live on the machine you play on.From the store listing

Only what the store discloses. Nothing listed here means the store disclosed nothing — not that there is nothing to disclose.

Features

Single-player
Multi-player
MMO
Co-op
Online Co-op
Cross-Platform Multiplayer
Steam Achievements
In-App Purchases
Family Sharing

From the game's Steam store page.

Languages

English · full audio
French · full audio
German · full audio
Japanese · full audio
Korean · full audio
Simplified Chinese · full audio

Steam lists 6 languages, 6 with full audio.

Age rating & content

DEJUS L · Violência fantasiosaThe rating board's own rating, as Steam relays it
IGRS 13 · Kekerasan Interaksi DaringThe rating board's own rating, as Steam relays it

Every game you own, in one library

Steam, Xbox, Epic, GOG, itch.io, Amazon and PlayStation, plus your installed EA, Ubisoft, Battle.net and Riot games. Free.

About this game

The developer's description, from the game's Steam store page.

The power fantasy of an MMO, with the automation of an incremental game

Make progress actively by buying upgrades, optimizing skill-tree builds, min-maxing your stats, and defeating bosses! Load up IdleOn the next day, spend your AFK gains earned while you were away, and buy MORE upgrades!

Create 11 unique Classes, from Divine Knight to Bubonic Conjuror

IdleOn lets you create 11 characters, so you'll have one of each class - each one plays a unique role in your account! Just don't forget about the secret class-line, including a secret Subclass, secret Elite-class, and secret Mastercl... I've already said too much...

Unique gameplay with non-fighting mechanics

You'll do more than just fight - in your quest toward the endgame, you'll need to attain full mastery over skills like Cooking, Woodcutting, Alchemy, Construction, and MUCH more!

Join the biggest incremental community in gaming - 200,000+ members

Developer posts, giveaways, and game discussions await you in IdleOn's Discord server!

Free-to-Play note:

IdleOn is free to play, and all classes, maps, skills, bosses, and activities are available without purchase. There is no paid DLC or exclusive gameplay content locked behind a paywall.

Optional in-game purchases are available, including helpful boosts and collectible pets, but they are not required to explore the world, unlock classes, or play through IdleOn’s core systems.

IdleOn is a long-term idler game, made for those seeking out a multi-year long experience!

Looking for a short, premium idler game instead? My new game Fortune Mill is what you want :D