Free games like functional
Below are 8 free-to-play Steam games similar to functional, ranked by player overlap and content similarity. No purchase or Steam login required to view the list. Every pick is a full free-to-play title — not a demo, trial, or time-limited giveaway. imho.run's catalogue refreshes daily, so newly free or newly popular titles surface here without manual editing.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like functional page.
Ranked picks
- 1
Revolution Idle
Free-to-play alternative to functional — no purchase or trial window. Shares Simulation with functional.
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?
- 2
Idle Research
Free-to-play alternative to functional — no purchase or trial window. Shares Simulation with functional.
Idle Research is an addictive, resource management, incremental game with both idle and active playstyles. Research and craft colorful Flasks and Tubes to earn as much Energy as possible! Big numbers guaranteed.
- 3
WooLoop
Free-to-play alternative to functional — no purchase or trial window. Shares Simulation with functional.
Wrap, weave, and wind your wool! Build works of art strand by strand, one loop at a time, in this tranquil game of craftsmanship. Draw inspiration from the large exhibition of levels available and unwind with the soothing soundtrack.
- 4
Plasma
Free-to-play alternative to functional — no purchase or trial window. Shares Simulation with functional.
Plasma is a pure engineering sandbox. Use advanced visual programming and robotics tools to create anything you can imagine.
- 5
Urbek City Builder: Prologue
Free-to-play alternative to functional — no purchase or trial window. Shares Simulation with functional.
Urbek City Builder: Prologue is a free city building game where you can build your own neighbourhoods: from nightlife district to industrial district. Don't exhaust your natural resources before you have an educated population to build more efficient structures. Try it yourself for free!
- 6
Jigsaw Puzzles Infinite
Free-to-play alternative to functional — no purchase or trial window. Shares Simulation with functional.
Sit back, relax and build puzzles to your heart's content. Assemble one of the many included puzzles, or add your own images. Customize size and shape of the pieces for any puzzle. Enjoy Classic mode or try out Zen mode for a new type of puzzle experience.
- 7
Mini Airways: Prologue
Free-to-play alternative to functional — no purchase or trial window. Shares Simulation with functional.
A real-time management game where you play the role of an air traffic controller. Clear your aircraft to takeoff & land, direct them to the destination...and most of all don't let them crash!! London, Tokyo, Shanghai... Test your ATC skills in distinctive maps around the globe!
- 8
ABI-DOS
Free-to-play alternative to functional — no purchase or trial window. Shares Simulation with functional.
Build the most advanced operating system ever created! Can you master the fictional simulation language of this mind-bending machine? Design circuits, automate UBITS (coloured mobile data blocks), and optimize your system. The Admin is always watching, and he’s not what he seems.