Zaxxon (ザクソン) is an arcade shoot 'em up video game released by Sega. It is named after its groundbreaking use of axonometric projection (though more specifically, it uses isometric projection) and was released for bespoke arcade hardware in 1982. Zaxxon was the first video game to use an isometric perspective, a graphical style which would see widespread use in the years which followed.
Zaxxon stands as one of Sega's earliest video game successes, and is also notable for being the first arcade game to be advertised on US television, with a commercial being produced by Paramount Pictures for $150,000.
In Zaxxon, the player controls a starship which continuously moves towards the top right of the screen - a "diagonal" sidescroller, as opposed to the horizontal or vertical shooters more commonly seen. The basic idea is to shoot at and destroy enemies within a space fortress to rank up points, while avoiding obstacles and enemy fire.
What made Zaxxon unique at the time was the ability for the player to adjust the ship's height as well as move the craft left and right, essentially creating one of the first three-dimensional shooters (though the player can still only move in two dimensions, as he/she cannot stop the ship from moving forward). With this comes the task of navigating scenery - Zaxxon has levels which take part in space stations, and the player must duck and dive to avoid crashing into objects. Furthermore missiles can be launched upwards from the ground (similar to Scramble by Konami), and the player must obtain fuel to stay airbourne.