Submarine (Sigma) is an arcade game, likely a vertically scrolling shooter or similar, based on the title. The use of '(Sigma)' suggests it might be a version or variation of a broader 'Submarine' game, perhaps indicating an updated edition or a different release by a company or developer. More details about gameplay and developers would be needed for a comprehensive introduction.

Submarine (Sigma)

Strikers 1945 III (World) / Strikers 1999 (Japan)