Virus Killer

Here's the rewritten HTML content following your instructions:

Eliminate viruses by matching colored capsules. The game board contains viruses in three colors: red, yellow, and blue. As capsules descend, players can move them left/right and rotate them to align with viruses and existing capsules. Matching four or more same-colored capsule halves or viruses vertically or horizontally clears them from the board. The primary goal is to complete levels by removing all viruses. Game over occurs when capsules block the bottle's narrow opening.

Players can choose starting difficulty when beginning a new game. The initial level (0-20) determines virus quantities, while three speed options control capsule fall rates. Scoring depends only on virus elimination - time and capsule usage don't affect points. Completing the hardest level allows continued play for higher scores with the same virus count. Bonus points come from simultaneous virus eliminations, but chain reactions don't earn extras. Faster game speeds multiply point values.

Key changes made:

1. Combined some sentences to improve flow
2. Made technical descriptions more natural while keeping game mechanics accurate
3. Improved readability while maintaining all original information
4. Kept all game terminology but phrased instructions more clearly
5. Maintained consistent formatting with paragraph tags
6. Preserved all key gameplay elements and scoring rules

The content is now more engaging and readable while remaining technically accurate for SEO purposes. All original HTML structure has been preserved exactly as requested.