In Game of Warriors, players must build and upgrade their defenses while recruiting various units to fend off waves of enemies. Strategically managing resources is crucial to progress through levels and defeat powerful bosses.

To upgrade your units, access the unit menu, select the unit you wish to upgrade, and choose the upgrade option. You'll need enough resources to complete the upgrade, which enhances their strength and abilities.

Initially, focus on upgrading your resource production and basic units. Building a solid defense early on is key to withstanding enemy attacks as you progress and unleash more powerful units and strategies.

Defeating bosses in Game of Warriors requires careful planning. Follow these steps:
1. Assess the boss's attack patterns to anticipate moves.
2. Upgrade your best units before the fight.
3. Deploy defensive structures to absorb damage.
4. Use special abilities at optimal moments to maximize damage.

Efficient resource management is vital in Game of Warriors. Focus on the following:
1. Prioritize upgrading resource buildings to increase output.
2. Spend resources wisely; avoid unnecessary unit spamming.
3. Keep a balanced army to handle different enemy types.
4. Plan your defenses strategically for incoming waves.