Doroppuboru 13 is a free online falling ball puzzle game where you control where each ball drops, stacking and organizing them to clear the screen before it overflows. Think Tetris but with bouncy balls — your job is to keep things tidy while the game keeps throwing more at you. One wrong drop and you are already in trouble. The game runs entirely in your browser with zero downloads or installs required.

What makes Doroppuboru 13 genuinely addictive is how quickly easy rounds turn chaotic. Balls fall faster as your score climbs, and the patterns you need to clear become trickier to manage. The controls are simple — position and drop — but thinking even two or three balls ahead is what separates a decent run from a great one. It rewards patience and fast reactions in equal measure, making each session feel competitive even against yourself.

If you enjoy casual brain-teaser games, stacking puzzles, or classic arcade-style challenges, Doroppuboru 13 hits that sweet spot. It is a solid pick for fans of falling block games, ball drop puzzles, and free browser sports games. Whether you are searching for a quick basketball-themed puzzle game to kill time or a free online casual game with real replay value, this one delivers a tight, satisfying loop every single time.