How to play
  • You are the ship. Enemy submarines cruise beneath you at every depth — sink them all with depth charges.
  • Steer: drag left or right anywhere on the screen (or use the arrow keys / A and D). The ship takes a moment to build speed.
  • Drop a charge: tap the water where you want it to go off — the charge rolls off the stern and sinks to the depth you tapped before it detonates. On a keyboard, Up/Down set the fuse depth (the dashed line) and Space drops. Charges sink slowly, so lead the sub: drop ahead of where it's heading.
  • Charges carry your ship's momentum — drop while moving and they drift the way you were going. They also go off early if they brush a sub.
  • The deeper the sub, the more points it's worth. Sink subs back-to-back without a wasted charge to build a score multiplier; a charge that hits nothing resets it.
  • Hunters fire torpedoes straight up at you — move out of the way, or blow the torpedo up with a charge. Heavies take several hits and release floating mines; don't sail into one.
  • Your crew reloads the rack a charge at a time — watch the pips. The sonar sweep lights up subs hiding in the deep.
  • Sink the patrol's quota to clear it; clear it without letting a sub slip past for a perfect bonus. Lose every ship and the hunt is over.
  • Pick your patrol on the title page: Rookie gives you four ships, a bigger rack and lazier subs; Ace is the real thing. Each keeps its own best score.