Arcade Game: Zaxxon and Super Zaxxon (1982 Sega)

Zaxxon:
A flying diagnol shooting 'em up game which you find yourself piloting an 'attack-shuttle' spacecraft, strafing the enemy's asteroid city in an attempt to destroy fuel tanks, gun emplacements, missiles, fighters and the dreaded enemy robot. With the aid of an altimeter that constantly monitors your height, you control your ship with an aircraft-style joystick, barnstorming your way through wall openings, under electronic barriers, dodging rockets, and in a later round, dueling with the insidious enemy robot. A successful attack-run across ZAXXON leads us to a deep-space dogfight with enemy planes. As you climb, turn and dive, a 'cross-hair' appears on the screen to indicate exact positioning for a laser hit on incoming craft. Notice the buffeting as you fly near 'proximity explosions'. In addition to your altitude, a running count is displayed of your score, number of ships remaining to you, number of enemy ships remaining to be destroyed, and fuel remaining. Fuel bonuses, as well as points, are awarded for destroying fuel tanks, but your ship crashes if you run out of fuel between rounds.. Zaxxon is the name of the enemy robot you must destroy. This was the first video game to use a 3D Isometric View months before qubert was released.
Super Zaxxon:
A 3-D isometric flying diagonal shooting 'em up game. This time, you fight 3 dragons by firing 6 shots into their mouths to destroy them.

Note: Invincibility cheat was used when down to last life. However, save states were used to show the ship destroying the 3 dragons as the game was moving too fast. The games are endless. Super Zaxxon gameplay starts at 42:50.

For all 3 dragons killed at the same time, you can watch it at 1:20:00.