Doroppuboru 13 is a casual online puzzle game featuring descending objects, such as balls or blocks, that players must strategically position. The main goal is to avoid cluttering the screen with these items by either clearing them or arranging them into designated patterns, reminiscent of well-known titles like Tetris. As players advance, the game ramps up the difficulty with increased speed and more intricate arrangements to tackle. This game challenges quick thinking, sharp reactions, and foresight. With its straightforward controls and captivating gameplay, it promises an engaging experience for players.