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;