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

2. Use your finger to control the shark's movements. Swipe left or right to move the shark in that direction, and tap the screen to make the shark jump.

3. Swim through the water and eat as many fish as possible to score points. The game will display your score at the top of the screen.

4. Avoid obstacles such as mines, jellyfish, and other dangerous creatures, as they can cause the game to end.

5. Collect power-ups, such as speed boosts and invincibility, to help you eat more fish and avoid obstacles.

6. The game can have multiple levels, and as you progress, the game will become more challenging with more obstacles and faster-moving fish.

7. The player with the highest score at the end of the game is the winner.