First you only see a window with four closed blinds. Behind the blinds enemy spacecraft move about and shoot at you. If you hit one of the enemies behind the blinds by pure chance the blind will open.
The idea of this arcade game is deceptively simple: Guide a marble down a path without hitting any obstacles or straying off the course. The game is viewed from an isometric perspective, which makes it harder to stay focused on the direction the ball is to follow. There are tight corridors to follow and enemies to avoid. There is a 2-player mode in which players must race to the finish; otherwise you're racing against the clock.
Wings Out of Shadow is a game named for a short story in the Berserker series by Fred Saberhagen, involving the hospital ship the Hope, its escort carrier Judith, and their complement of nine outnumbered fighter ships. Saberhagen wrote the in-game text.