Ultimate Wizard

Wikipedia: Ultimate_Wizard

Defined by

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Platformer, Commodore 64, joystick and 1 button

Commentary

To this day, this stands as the best video game that EA ever released. (I can't say best game in toto, because that might be better reserved for Adventure Construction Set.) Sure, it was something of a ripoff of Jumpman. But it added so many elements, played really well, and best of all, had a level editor. I'm a sucker for a level editor.