If you like challenging puzzle games that start simple to get you hooked and then get challenging, you will appreciate RGB Express. This game has been available on iOS devices for a while and has now come to Android. The game involves picking a path for the colored trucks so they can drop their deliveries off at the right color building.
Players draw the path the trucks will take around a city map. The truck can only pick up one block at a time and has to drop it off at the correct colored building before it can pick up the next block. Where things get challenging is when there are multiple trucks and blocks to pick up on a single map.
The trucks can cross paths, but they can't follow the same straight sections of road. That means you have to carefully map out the path the trucks will take. Some maps will take several tries to complete. The free version of the game has 200 levels.
A paid version of the game is available that adds 80 additional levels and removes the ads. Three free hints are included and others can be purchased in-app. A king truck can also be purchased in-app.
SOURCE: Google Play