Railbound (2022)

Numbered carriages make the required train order explicit, while colourblind mode supplies symbols for tunnel connections. Turn it on in Settings, Accessibility and use an updated PC build; later updates also distinguish tunnel markings from newer carriage symbols. The puzzles reward tracing routes and timing arrivals on a small board. This is a particularly clear starting point if you want colourful artwork without having to infer destinations from colour alone.