From beneath the ocean surface, boomer submarines from the six nuclear nations are preparing to launch their radioactive payload. In Con Sonar! your goal is to sink more enemy submarines than the other players, while making sure your own subs survive.

Players attempt to track down enemy subs using fleet cards. Each fleet card has a colour, a symbol, a firing solution effect and an arrow pointing to another symbol.  An 8 step ladder represents the quality of the firing solution any fleet can have on target subs.