If Red Then Stop

Image source: Steam store page

A puzzle game about fixing a city's traffic. You play an engineer in a Swiss city whose new traffic lights are badly programmed, and residents let you know what they think of your fixes.

How you code

You program traffic lights, barriers and crossings as state machines: each system moves between states, such as red, amber and green, based on timers and events. A manual inside the game explains the approach, which comes from industrial automation. Vehicles and pedestrians then run through your design, and later levels connect several systems that have to work together.

Details

Categories: Code puzzlers, Automation and optimization sims

Platforms: Windows, Linux

Cost: Free (demo)

Language: State machines

Demo only: the free demo has the first six levels. The full game is listed on Steam without a release date.

Last verified: 2026-10-10

https://store.steampowered.com/app/4022900/If_Red_Then_Stop_Demo/