Based on the obscure coin-op game of the same name, Espial puts you in the role of a space attack pilot flying over a gigantic star ship. Your mission is to destroy the star ship with your fighter's super powerful cursor scope missiles.
While you are in flight, a never-ending onslaught of defense squadrons will come after you. Use your laser beam gun to destroy the enemies' flying objects, bombs, cannons, cells and fortress. Flying objects consist of diamonds and other shapes that move in varying flight paths.
Your double-barreled missile is good for destroying the cannons, fortress, cell and shelters on the surface of the enemy star ship. Positioned ahead of your fighter is a cross cursor scope, which helps you aim your missiles.
There are three types of enemy bases: Block Base, Fantasy Base and Diamond Base. After you pass one enemy base, you will be rewarded with a congratulatory musical tune. You continue cycling through the bases until each of your five fighters has been destroyed.