Diamond Ball is a rather simple game so I'll keep the review short and to the point. You play a ball that, surprisingly enough, bounces up and down. You are only able to move it sideways inside a maze that consists of coloured bricks which disappear when the ball (of the same colour) hits them.
To change the balls' colour, you can hit special bricks. Once a maze is cleared, a number of diamonds are released which you need to collect in order to proceed to the next level. To make the game more difficult, the makers also scattered some deadly bricks around and arranged the actual mazes in different weird and hard to figure out ways.
A manual is included (just press the up-arrow), as well as the level editor in case the 50 standard levels are not enough for you!