-Add buffering when you switch from walking to running.
-Fix sound setting bugs.
-Adjust the HP of zombies.
-Optimize view rotation of character.
-Fix some language errors.
-Adjust the shooting distance of some guns.
-Fix the bug that some items will disappear after reloading.
-Fix the bug that map will pop up automatically when jumping or opening backpack.
-Fix the bug that you will equip all items when quickly switch items.
-Add Steam DRM settings.