Achieving an S-Rank on chapters requires a combination of speed, accuracy, and efficiency. Aim for high accuracy (above 70%), complete the chapter quickly, and take minimal damage. Headshots and melee follow-ups contribute to higher scores. Don't waste ammo, and try to avoid using too many healing items. Knowing enemy spawns and optimal routes is crucial for speedrunning. Playing on easier difficulties can help you practice routes before tackling Professional.

S-Rank Criteria:
- Completion Time: Finish as quickly as possible.
- Accuracy: Maintain high accuracy (aim for 70%+).
- Damage Taken: Minimize damage received.
- Enemies Defeated: Clear most enemies efficiently.
- Deaths: Avoid dying.