A Ruler is a free educational game available on Android platform, designed for kids to learn how to read measuring scales on a ruler, whether it's in centimeters or inches. The game's objective is to measure the possible width of an object, with each task becoming more difficult as the player progresses. By completing all tasks, the player is expected to be able to read the scale of measurement on a ruler.

The interface of A Ruler app is simple and easy to use. The player has to measure the width of the object by dragging the ruler on the screen. The game provides different objects with varying widths, and the player has to measure them correctly to move on to the next level. The game also offers a tutorial mode to guide the player on how to use the ruler properly.

Overall, A Ruler is an excellent game for kids to learn how to read measuring scales on a ruler. The game is simple, user-friendly, and provides an entertaining way to learn an important skill. Download it for free and have fun while learning!