Eliminate all viruses by strategically matching capsules of the same color. The game features red, yellow, and blue viruses. Players control falling capsules, moving and rotating them to align with viruses and existing capsules. Four or more horizontally or vertically aligned capsules/viruses of the same color are removed. The goal is to clear all viruses from the playing field to complete each level. Game over occurs if capsules block the bottle's neck.
Difficulty is selectable at the start of each game. A starting level (0-20) determines the number of viruses to clear, and three speed options control capsule descent. Scoring is based solely on virus eliminations, not time or capsule usage. Higher difficulty levels offer no increase in viruses to clear but allow for higher score accumulation. Bonus points are awarded for simultaneous eliminations of multiple viruses, but not for chain reactions. Faster game speeds result in higher scores.
