Doroppuboru 13

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Doroppuboru 13 is a browser-based falling-object puzzle game that plays directly in the browser without any installation. Numbered balls drop one at a time from above into a contained play area, and you position each ball left or right before it lands using mouse movement or left and right arrow keys. When two balls carrying the same number collide or stack together they merge into a single ball with the next higher number, clearing space and scoring points. The objective is to keep the accumulated pile of unmerged balls below the upper boundary line; crossing it ends the game. Strategic stacking and anticipating merge chains are the core skill, as a well-placed ball can trigger a cascade of three or four merges at once for large point bonuses. Ball drop speed does not increase over time in early play, but the accumulating pile creates natural pressure as sessions extend. A typical game lasts four to ten minutes. The number progression runs from 1 through 13, making a ball numbered 13 the highest achievable merge and a rare high-score event. No account is required to play.