Here is the concept art to Sentinel the unreleased pinball/arcade hybrid Here is the art to the playfield and to the monitor. not sure if you can read the text on the 2nd one. here it is. LEFT SIDE * PRESS START * PROTECT SENTRAL BASE BY DESTROYING ATTACKING ALIENS * ENEMY SHOTS DESTROY PLAYERS SHIELD 1 ENEMY SHOT PENETRATING SHIELD RESULTS IN LOSS OF 1 LIFE * PLAYER BEGINS WITH 3 LIVES BONUS LIFE EVERY 10,000 POINTS *DESTROY ALL ALIENS-ESCAPING ALIENS WILL RETURN TO INCREASE THE DIFFICULTY OF THE NEXT WAVE RIGHT SIDE CONTROLS MISSLE: FIRES INDIVIDUAL SHOTS AIM WITH CURSOR CANNON: DESTROYS SEVERAL ALIENS AT ONCE SET CURSOR IN DESIRED HALF-RING PRESS BUTTON TO FIRE BALL THROUGH CORRESPONDING LANE,DESTROYING ALL ALIENS IN THAT HALF RING ZOOM: REVEALS CLOSE-UP VIEW OF CENTEAL AREA PRESS BUTTON WHEN ALIENS ENTER CENTER AREA GHOST SHIP: MAKES PLAYER'S BASE DISAPPEAR CAUSES ALIEN SHOTS TO TRACK ON OTHER ALIENS AVAILABLE ONCE PER LIFE ZAP TARGET: WHEN FLASHING DESTROYS ALL ALIENS IN RINGS WHEN LIT MOMENTARILY FREESES ALIENSSET CURSOR IN CENTRAL AREA TO AIM CANNON AT TARGET and here is the cabinet
