The following updates are based on the back room map
1, Adjust the voice of the female researcher, used to prompt the player how to obtain the password of the cipher
2. Redisplay the cheat code interface
3, generated zombies will also effect the "bunny zombie" command
4. After picking up ak74, it will be automatically equipped
5. Add a scroll button to switch weapons
6, the back room map added saving resurrection points, when the player successfully opened the first safety door, the subsequent death restart will continue from this task