1. When you start the game, you'll see a menu with various options such as starting the game, adjusting settings, or viewing the credits.

2. Select the "Start" option to begin the game. You'll be taken to a level selection screen where you can choose which level to play.

3. Use the arrow gamepad to control Cuphead and Mugman as they progress through the level. Press the "Jump" button to jump and avoid obstacles, and press the "Shoot" button to fire at enemies.

4. Collect coins throughout the level to purchase upgrades and new abilities.

5. As you progress through the game, you'll encounter bosses at the end of each level. Defeat the bosses by dodging their attacks and attacking their weak spots.

6. Watch out for hazards like spikes, fire, and flying projectiles. Try to avoid them as much as possible.

7. Use special abilities like dashing and parrying to get through tricky sections of the levels.

8. Keep playing and try to beat all of the levels and bosses in the game.