1. Start the game by pressing the play button. 2. You will be taken to the main menu wHere you can select the DIFFiculty level, game mode, and view the instructions. 3. Select your DIFFiculty level and game mode. The game modes are Solo, Co-op, and Versus. 4. Once you have selected your game mode and DIFFiculty, you will be taken to the game screen. 5. Use the Arrow keys to move your character around the map and shoot enemies with the spacebar. 6. Collect Power-Ups to increase your Health, ammo, and score. 7. Defeat all of the enemies to complete the level. 8. Repeat Steps 5-7 until you reach the end of the game.