Battlesubs

You've heard of the game Battleship, and you may have even heard of or played 3d Battleship in space where there are three layers.

This is based on that premise but either side of the game board is an actual cubic grid in which to place your submarines.
Given that it would be extremely difficult to place your submarine within a grid LED's at the intersections will illuminate to indicate the positions of your vessels, and here's the kick, they can be in any orientation. Vertical, horizontal or off on any kilter you fancy.

The subs will also be moving throughout the game so you can set and change the trajectory of any of your subs at the start of each turn but only 1/3 angle change from the previous trajectory.
Each type of sub moves at different rates of speed with the smallest able to zip three spaces in per turn, medium two spaces, and larger subs only get one.

As an added challenge I propose that only a given number of torpedoes are in each players arsenal and that each turn not firing a torpedo is spent sending a "ping".
Pings are unlimited but depend on proximity to whichever sub you chose to 'ping' from which gives the opponent some clue as to your subs whereabouts at that point in the game but no clue as to your heading.
LED's diminishing in intensity show you the wake of each of your subs.

You would need to defend your large subs because the amount of torpedoes each sub carries is dependant on its size, and when that sub receives its number of hits then any unused torpedoes implode with them and are taken from your arsenal.

Also the firing of torpedoes is proximity dependant meaning only the closest of your subs can take the shot. If your closest sub is depleted then the next closest would be the one to fire.