In this game there will be in-game currency and can be used to upgrade stuff so player will get stronger overtime, while playing you can move around freely across the screen and your objective is to kill all zombies until you finish the stage, while in-game you can change weapon that provide inside every stages randomly for limited time so the can keep the balance between player and npc and more challenging rather than just shoot randomly you need to think to use your weapon efficiently. Every several stages the theme will change so player can have different experience in every stages.

After beating the game player can unlock several new game mode or bonus stages so it become more worth it when the game is finish. So the in-game process player build up doesn't feel to go on waste after finishing the game either and have more sense of accomplishment.