Single-player games like Idle Sphere
Below are 8 single-player Steam games similar to Idle Sphere, ranked by player overlap. Every pick carries Steam's Single-player category, so multiplayer-only titles or always-online games don't sneak in. imho.run pulls the category data from Steam directly — Single-player here matches what the store labels.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Idle Sphere page.
Ranked picks
- 1
Galaxy Idle Clicker
Single-player alternative to Idle Sphere — playable solo, no multiplayer required. Shares Indie and Simulation with Idle Sphere.
Embark on an interstellar journey with Galaxy Idle Clicker! Conquer galaxies, upgrade your spaceship, and face off against a myriad of enemy ships. With engaging minigames, powerful upgrades, GIC delivers an unparalleled idle space adventure. Join the cosmic conquest today and dominate the universe!
- 2
Idle Spiral
Single-player alternative to Idle Sphere — playable solo, no multiplayer required. Shares Strategy and Indie with Idle Sphere.
This is a beautiful "Idle", "Incremental" game based on spirals and mathematics. Your goal is to make the spiral grow farther and farther from the origin. The game is very simple, but it is very deep and can be enjoyed for a long time!
- 3
Incremental Cubes
Single-player alternative to Idle Sphere — playable solo, no multiplayer required. Shares Simulation and Free To Play with Idle Sphere.
Cube based incremental game that is simple but very deep!
- 4
Idle Tower Defense
Single-player alternative to Idle Sphere — playable solo, no multiplayer required. Shares Strategy and Indie with Idle Sphere.
Idle Tower Defense is a game where you control a single tower to fight off hordes of enemies. No randomization. Choose from a variety of modules to create unique builds and upgrade modules and survive endless waves.
- 5
Idle Hero TD - Tower Defense
Single-player alternative to Idle Sphere — playable solo, no multiplayer required. Shares Strategy and Indie with Idle Sphere.
Endless idle tower defense game full of deep strategy and combat mechanics. Unlock and upgrade dozens of epic fantasy heroes to defeat an infinite swarm of enemy monsters. Strategize hero positions, synergies, and skills for an effective defense, then sit back and let the auto-battler do its thing!
- 6
Revolution Idle
Single-player alternative to Idle Sphere — playable solo, no multiplayer required. Shares Indie and Simulation with Idle Sphere.
Join an experience where each revolution takes you further into the unknown! Revolution Idle challenges you to multiply your accumulators to reach unimaginable heights. Will you manage to reach infinity?
- 7
Rocky Idle
Single-player alternative to Idle Sphere — playable solo, no multiplayer required. Shares Indie and Casual with Idle Sphere.
Rocky Idle is a single-player idle/incremental game. Level up your skills, gather resources, and complete your collection log.
- 8
Feed the Reactor
Single-player alternative to Idle Sphere — playable solo, no multiplayer required. Shares Strategy and Simulation with Idle Sphere.
An incremental unfolding game about feeding fuel into a reactor. Combine elements to produce energy, unlock exotic technologies and explore a strange galaxy.