The current version features only 15 levels， with difficulty increasing in a stepwise progression. The initial stages require minimal movement， allowing you to eliminate zombies while stationary. Every fifth level presents a boss encounter with slightly heightened difficulty. Below， I shall outline strategies for overcoming each boss. 1. Level 5 Large Zombie：Moves at moderate speed，Possesses no ranged abilities，Each strike inflicts 20 HP damage，Maintain a safe distance to clear the level unscathed 2. Level 10 Pterosaur Zombie:Primarily summons small pterosaurs for dive attacks， each dealing 36 HP damage. Simply dodge left or right during the dive to evade. 3. Level 15 Pharaoh Zombie:Moves at moderate speed and uses a shield for defence. If the player strays too far， it will leap into the air and descend near the player. 4. Each first aid kit restores 60 HP. As levels progress， standard enemy damage increases incrementally. Beyond Level 10， upgrading to more potent weaponry is advisable to ensure a viable clear. 5. Hold the Shift key to increase running speed. 6. Green dots on the map indicate first aid kits， while red dots mark zombies. Monitor the constant emergence of zombies during combat to prevent flanking attacks. 7. Health is cumulative； it does not reset after clearing a level. Maintain a healthy health level when entering subsequent levels.