Bermuda Triangle

Bermuda Triangle is a Shoot 'em Up released by SNK in 1987 for Arcades.

Story
Finally, the space-time battleship ZIG launched. War moves from the present to the past. An unidentified enemy had begun to invade our history itself. The battle of SYD was won. However, we learned that it was only a victory at the present level. Then, in an emergency system, the ZIGs in the trial stage were ordered to be dispatched. If we never return, there is no way back.

Gameplay
Players control a large ship in a vertically scrolling screen. Button One is used for shooting while Button Two changes the option's formation. The options are tiny little ships which add to the player's firepower and protects it from damage. By pressing the second button the options can be set on the front, back and sides of the player ship. By destroying enemies the player can collect power-ups which change the ship's sprites. Instead of lives, the ship has a fuel bar which depletes whenever the player takes damage.