Update log December 31, 2021 1. Adjust the database structure so that the server can accommodate more users at present; 2. Optimization of operation efficiency; 3. Balance adjustment -Pulse laser reduced to level 1 weapon; -Railgun upgraded to level 4 weapon, damage increased and warm-up increased; -Shotgun damage increased; -The damage of multi barrel machine gun increases slightly and the ammunition load increases; -Laser cannon damage increased slightly; -Short range missile damage increased, range increased; -The sight and range of missile turret are improved; -The threat isolation system limits that each player can only have one in the whole game at the same time; 4. Convoy mode, route optimization, route lengthening at the first checkpoint, ensuring that each game is not less than 5 minutes; 5. The difficulty of the tutorial level is reduced; 6. Highlighted some tips and feedback; 7. Fixed some bugs; 8. The North American server is available;