Destroy the enemy submarines using your depth charges. You may only drop one charge at a time, so time the detonation to hit enemies with the explosion.
Deeper submarines are worth more points, and any remaining time will award a points bonus. When it gets dark you can use the sonar to detect enemies.
Crates that fall from the sky will grant a random powerup. Planes that fly overhead may drop mines, so be careful!
- ← and → to move
- SPACE to drop a depth charge
- SPACE to detonate a dropped charge
- S to emit a sonar pulse
- ESC to quit.