Spacewar!
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Spacewar! is one of the first known video games. In this game, the player has to shoot the other spaceship while flying around a star. The ships fired missiles ( rockets) which were unaffected ( had no effect) by the gravity. Each ship had only a few missiles and only a little bit of fuel. The hyperspace could be used to avoid from being hit by an missile but the ship would come back at a random location. And the more the player used it, the bigger the chance that the spaceship would explode.