Best Second Monitor Games: Idle Games to Run While You Work
A second monitor game has a specific job. It has to keep making progress when you are not looking at it, survive being ignored for an hour, and never demand a reaction at the exact moment your other screen does. That rules out most games and almost all of them with a fail state.
What is left is the idle and incremental genre, and even inside it the fit varies. We picked for three things: offline or background progress, automation you can set and forget, and a window that behaves whether that is a browser tab, a small desktop window or a phone propped next to the keyboard.
Ranked roughly by how well each one tolerates being ignored. Free picks are marked in the blurbs. More at idle games, browser games and the offline progress tag.
The Tower - Idle Tower Defense
The benchmark. Endless tower runs with prestige currencies stacked on prestige currencies and offline progression that genuinely matters, not a token catch-up bonus. It runs on your phone next to the keyboard, which means it never fights your actual desktop for space.
IdleOn
Built around being away. Your characters keep fighting and skilling while the game is closed, and the loop is to come back, spend the AFK gains, and set them off again. Eleven classes and twenty skills means there is always something worth queueing before you tab out. Free to play.
Leaf Blower Revolution - Idle Game
The comfort pick. Buy Autoblowers, let them work, come back to a pile of fruit and prestige coins. Forty-plus areas, a crafting system and dozens of pets give it a very long tail, and it asks almost nothing of you between check-ins.
The Perfect Tower II
The one for people who want to engineer their idle game. It has genuine scripting automation, so you can build a machine that plays correctly without you and then just watch it earn. Pick an idle build and it will happily run all afternoon in a corner of the screen.
Revolution Idle
The best free option here. Offline progress, stacking prestige layers and automation that keeps compounding, wrapped in a clean interface that reads fine at a glance from three feet away. Costs nothing to leave open indefinitely.
Unnamed Space Idle
A long-form sci-fi idle with more than ten systems that unfold over weeks. You tune your ship's weapons and defenses against specific enemy types, then leave it grinding down alien waves. Deep enough to reward a real check-in, patient enough to not need one.
Incremental Infinity
Explicitly designed for this. It fires automatically, the skill tree is procedurally generated and never ends, and the developer suggests pinning it as a side window while you work. Abstract and quiet, with no art competing for your attention.
Stellar Odyssey
The best trick on the list: battling and gathering keep running server-side for a full 24 hours after you close the tab. Exploration income scales with distance from the start with no cap, so the number keeps climbing whether or not the browser is open. Free.
Theresmore
A free browser civilization incremental that moves slowly by design, which is exactly what you want in a background tab. Research ticks along, buildings finish, and every time you glance over there is one more decision waiting rather than an emergency.
AdVenture Capitalist
The original set-and-forget. Hire managers and every business runs itself, then come back to collect offline earnings and reset for angel investors. It is the blueprint the whole genre copied, and it still works fine in a small window.
Cell to Singularity - Evolution Never Ends
The prettiest one to leave visible. Four and a half billion years of evolution unfolding from primordial soup to the singularity, accumulating entropy the whole time. Nice to look over at, and it does not mind being ignored between chapters.
Hearth and Hamlet
Cozy pixel-art city building with an idle engine underneath and offline progress on top. Food and materials accumulate while you are gone, so a check-in is about spending a stockpile rather than rescuing anything. Low stakes on purpose.
The short version: if you want one game that never needs you, take The Tower or Revolution Idle. If you want something to actually think about on your breaks, take The Perfect Tower II or Unnamed Space Idle.
For more that fit the same slot, browse free incremental and idle games or the offline progress tag. Fresh arrivals are in the September new releases.
Got a better second-screen game than these? Submit it.
More guides
View all
Best idle games on Steam
Twelve idle and incremental games on Steam with the highest player approval, each backed by more than a thousand reviews. Three of them are free.
Short incremental games you can finish in a weekend
Ten incremental games with a real ending, from a one-hour free browser game to a five-hour Steam campaign. Playtimes come from the developers, and four of the ten are free.
Best idle games on mobile
Ten idle and incremental games for iPhone and Android, from The Tower and AdVenture Capitalist to small solo-developer games with no ads at all.