Rainbow Balls

Rainbow Balls is a freeware Russian game of logic.

The game field is a grid of 9 x 9 cells with five balls of different colors drawn on it. After each move, three more balls will appear. Before the move, they are displayed in the upper left corner of the game's window. The object of the game is to build a line of at least five balls of the same color and score as much as possible (best scores are recorded and appear after pressing the "Best Results" button). The lines can be horizontal, vertical or diagonal. A completed line disappears and the game goes on. When the game field is filled with balls, the game ends.

The authors of Rainbow Balls describe it as a "freeware test program".