1. Launch the app and select "Play" to start a new game.

2. The game will display the mission objective and the number of players required to complete the mission.

3. To join a mission, select "Join" and wait for other players to join.

4. Once the mission starts, players must work together to complete the objective, which may involve fighting zombies, solving puzzles, or escaping danger.

5. To move the character, use the directional buttons or swipe the screen in the direction you want the character to move.

6. To attack zombies, tap the "Attack" button at the bottom of the screen.

7. Players can also use various weapons and items found throughout the game to help them complete the mission.

8. The game has various levels, and as players progress, the difficulty increases, requiring better teamwork and coordination.