To unlock all characters, you need to complete specific in-game challenges and objectives. Focus on key missions and collect special items that can be found throughout the game. Completing these tasks will gradually unlock new characters.

Different weapons have unique attributes such as damage, range, and firing rate. Experimenting with various weapons helps you find the ideal one for your preferred playstyle. Some weapons may excel in specific scenarios or against particular enemies.

To earn in-game currency efficiently, participate in daily challenges and complete missions. Engaging in multiplayer modes can also yield higher rewards. Keep an eye out for special events that offer bonuses for completing certain tasks.

To upgrade your character’s skills, you need to accumulate experience points (XP) by completing missions and defeating enemies. After gaining enough XP, navigate to the skill tree in the character menu and choose which skills to enhance. Steps: 1. Play missions to earn XP. 2. Access the character menu. 3. Find the skill tree section. 4. Select skills to upgrade.

Defeating difficult bosses requires strategic planning. Ensure you know the boss's attack patterns and weaknesses. Use a combination of quick attacks and evasive maneuvers, and don’t hesitate to change your weapon for better effectiveness. Crowd control spells or items can also help.