Best Idle and Incremental Games on Steam

Incremental games are about watching numbers grow and then finding the next layer that makes them grow faster. They run quietly in the background, reward a few minutes of decisions with hours of progress, and keep revealing new systems long after you think you have seen them all. For achievement hunters they are a special case: many carry hundreds of achievements that tick over while you do something else.

1

Cookie Clicker

The game that defined the genre, with a deep layer of upgrades, minigames and ascensions under the cookies. Its achievement list is enormous and mostly earned by simply letting it run.

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2

Antimatter Dimensions

A number-go-up game that keeps unlocking whole new mechanics, with a long route of prestige layers and challenges. One hundred achievements that track real milestones in the climb.

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3

Melvor Idle

A RuneScape-style skilling game turned into an idler: train dozens of skills, gear up and send your character into combat while you are away. A satisfying, long completion.

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4

NGU IDLE

A deliberately silly idle RPG with an absurd number of interlocking systems. Very long, very funny, and the achievements pace out a huge journey.

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5

Revolution Idle

A clean, modern incremental with layered prestige mechanics. Its several hundred achievements reward pushing each new layer as far as it goes.

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6

Unnamed Space Idle

A space-themed incremental built around ship upgrades, research and many unlockable systems. Hundreds of achievements and a steady stream of new things to optimise.

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7

Idle Slayer

A light auto-runner idle game where you jump, slay and buy upgrades, with plenty of events and side systems. Its long achievement list fills in gradually.

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8

Clicker Heroes

A classic clicker RPG: hire heroes, defeat bosses and ascend for permanent bonuses. A good first idle game with a manageable achievement list.

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9

Rusty's Retirement

A tiny farming idler that sits at the edge of your screen while you work. Robots tend the crops, and achievements arrive at a gentle pace.

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10

IdleOn - The Incremental MMO

An idle game with a whole MMO's worth of characters, worlds and skills to manage. Huge in scope, and the achievements reflect that.

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Updated 2026-10-12. Every game links to its full SteamVault page with achievement stats, rarity and community completion times.