Color logicRoute several states
Sources, destinations and transformations form a compact network where each line changes the rest.
Draw · Test · Refine
Guide every train to the right station. Split and repaint colors, share tracks, control timing and refine the network until everything clicks.



100 handcrafted levels
Each puzzle introduces a deliberate idea, then combines routes, colors, painters, splitters, obstacles and timing into increasingly dense systems.
Selected puzzle systems
Higher levels stay compact, but every piece carries more meaning. Real boards move from color routing to chained painting and tight obstacle layouts.
Color logicSources, destinations and transformations form a compact network where each line changes the rest.
Paint chainPainters and ordered destinations turn one route into a problem of timing, conversion and shared space.
ConstraintObstacles reduce the available space until a clean solution emerges from a tightly structured board.
Visual language
Routes stay neutral. Mechanics carry controlled color. Smaller sources and destinations support the puzzle while splitters, painters and obstacles define it.
Built from the game itself
Dark layered surfaces, two-stage borders, restrained colors and compact labels keep the interface tactile without adding noise.

Neutral structure first. Color appears only where it communicates state.


Splitters and painters carry distinct roles through controlled color.

Obstacles stay tactile, compact and immediately readable.
Made to think with
Build the complete route, start the simulation, change the speed, inspect what fails and refine the board without friction.
Tiny Trains for iPhone and iPad
Start with a line. Press play. Find the problem. Make it elegant.