Sub Killer is a classic old school arcade game, Use your mouse to set the fuse depth for the Depth charges then hit left button to drop a Depth charge. Time it just right and take out a enemy sub. but watch out the large sub is a ballistic missile launcher and can take you out.
Use mouse to move timer line to where you want depth charge to detonate then press left mouse button to launch Depth charge off ship.
Use "Space Bar" to slow ship for a better chance.