Sector Strike by retronix is a puzzle strategy game made for Sinclair ZX Spectrum.
The story of the game is about some aliens who came from nowhere. Without any warning, a series of portals opened up, threatening to swallow Earth’s most distant colonies. Your task is to position the fleet’s most powerful ship and launch plasma bolts across the grid, in order to close these portals. But beware, the aliens will soon detect your presence and try to block you. You have to be very careful and try your luck.