Editing Gravitar (section)

==Gameplay==
[[File:gravitar2.png|thumb|left|The north planet in second universe]]

The player controls a small blue spacecraft. The game starts in a fictional [[planetary system|solar system]] with several planets to explore. If the player moves their ship into a planet, they will be taken to a side-view landscape. Unlike many other shooting games, [[gravity]] plays a fair part in ''Gravitar'': the ship will be pulled slowly to the deadly star in the overworld, and downward in the side-view levels. Great precision is demanded of the player, as the ship rotates too slowly to allow a player to correct their mistake if they apply too much thrust and fly toward an obstacle.

The player has five buttons: one each to rotate the ship left or right, one to shoot, one to activate the [[Rocket engine|thruster]], and one for both a [[tractor beam]] and force field. ''Gravitar'', ''[[Asteroids (video game)|Asteroids]]'', ''[[Asteroids Deluxe#Legacy|Asteroids Deluxe]]'' and ''[[Space Duel]]'' all used similar 5-button controlling systems.

In the side-view levels, the player has to destroy red bunkers that shoot constantly, and can also use the tractor beam to pick up blue [[fuel]] tanks. Once all of the bunkers are destroyed, the planet will blow up, and the player will earn a bonus. Once all planets are destroyed, the player will move onto another solar system.

The player will lose a life if they crash into the terrain or get hit by an enemy's shot, and the game will end immediately if fuel runs out.

''Gravitar'' has 12 different planets. ''Red Planet'' is available in all 3 phases in the universe; it contains a reactor. Shooting the reactor core activates a link. Escaping the reactor successfully moves the player to the next phase of planets, awards bonus points and 7500 units of fuel. Reactor escape time reduces after each phase and eventually becomes virtually impossible to complete.

[[File:reactor.png|thumb|The reactor is at the end of a narrow tunnel.]]

After completing all 11 planets (or alternatively completing the reactor three times) the player enters the second universe and the gravity will reverse. Instead of dragging the ship towards the planet surface, the gravity pushes it away. In the third universe the landscape becomes invisible and the gravity is positive again. The final, fourth universe, has invisible landscape and reverse gravity. After completing the fourth universe the game starts over, but the reactor escape time will never reset back to high levels again.

The programmers thought that even the best players could never complete the most difficult planets on the invisible levels. Neither of the key developers themselves, Mike Hally and Rich Adam, have ever completed their own game "without cheating" (their words).<ref>{{cite web |url=http://www.cooganphoto.com/gravitar/interview.html#interview |title=Interview with Mike Hally and Rich Adam |accessdate=2012-04-10}}</ref>