How to quickly upgrade the tomb raiding defense 4?

If 1 and tomb raiding defense 4 are upgraded, you can quickly gain experience by doing tasks and side missions, completing pp trials, and taking zombie graffiti. Fill up the blood as much as possible in the early stage, and then increase the food carrying capacity, food returning blood volume and weapon carrying capacity.

2. Tomb Raider Defense 4 is an action adventure game made by Capcom and EpicGames using Unreal 4 engine, and it is the orthodox sequel to Tomb Raider Defense 3. The story background of the game is set in an abandoned city that has been occupied by zombies. Players continue to play FrankWest and return to Willamette after the original event 16, and will go deep into this horrible place. Continuing the characteristics of the previous game, the items collected in the game can form a variety of powerful weapons to help players fight the tide army of zombies. At the same time, Capcom also joined the four-person cooperation mode in this work.