Ultima Ratio is a vertical scrolling arcade shoot ’em up, set in space above the earth.
A nine platform alien spacecraft called Ultima Ratio has arrived in earth orbit, and the player must fly their fighter over the surface of the spacecraft and blast everything they can!
Each platform has to be totally cleared within a time-limit before the player can progress to the next one. Some obstacles on the surface will deflect the player's shots, whilst other obstacles can be destroyed.
The fighter's shields and fuel can be replenished at certain points during each platform, and the player must also be aware of direction-changing devices on the surface.