As you play and earn points, you'll unlock various skills that can be equipped to your characters. These skills provide passive bonuses and are crucial for optimizing your performance.

- Skill Points: Earned by completing missions and achieving high scores.
- Skill Slots: Each character has a limited number of skill slots. You must choose which skills to equip strategically.
- Skill Types: Skills can boost weapon damage (e.g., 'Handgun Master'), increase health (e.g., 'Health Boost'), extend combo duration (e.g., 'Combo Bonus'), or provide other tactical advantages.
- Skill Levels: Many skills have multiple levels, becoming more powerful as you invest more skill points into them.
Experiment with different skill combinations to find what works best for your playstyle and for specific missions. For example, 'Combo Bonus' is essential for high-score runs, while 'Health Boost' might be better for learning a new, difficult mission. Regularly check the 'Skills' menu to see what new skills are available and to upgrade existing ones.