Marble on Rails is a free Android game developed by dbitware in the simulation category. This game allows you to create your own tracks and explore them with marbles. You can change the viewpoint and the number of balls, which adds to the fun and creativity of the game.

One of the best features of Marble on Rails is the course edit mode. This mode allows you to create your own tracks by dragging and dropping pieces of the track onto the screen. You can customize the track with different pieces, including loops, jumps, and straightaways. Once your track is complete, you can explore it with your marbles and see how they navigate through the twists and turns you've created. The game also includes a course data import/export function, which allows you to save and share your tracks with others.

Overall, Marble on Rails is a fun and entertaining game that provides hours of creative gameplay. The graphics are well-designed and the controls are easy to use, making it accessible for players of all ages. If you're looking for a simulation game that allows you to explore your creativity, then Marble on Rails is definitely worth a try.