Control your vessel using the keyboard or mouse: input depth values with either the on-screen number pad or your keyboard’s number keys. Navigate by pressing the A/D or arrow keys. Clear your current depth entry with the X key or the on-screen X button. Initiate attacks by pressing the spacebar or clicking the Launch button to deploy depth charges.
Destroy enemy submarines before they strike. Calculate their depth—determined by solving the rapid-fire multiplication equations—and fire your weapons. Dodge incoming torpedoes to protect your hull integrity. One wrong answer, one missed evasion, and the ocean becomes your grave.
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