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Super Mario Bros. 1
Breakthrough Hit: was the breakthrough for Super Mario Bros. 1 Nintendo as a console game developer and the breakthrough for the industry as a whole after the crash of '83.
Mid Development Genre Shift: The NES version of Super Mario Bros. was going to be a shoot-em-up platformer, and Mario was going to carry guns, like a beam gun similar to those in and a rifle. Metroid Also, he was going to punch and kick enemies while empty-handed, ride on clouds (which was previously rockets in earlier development) and fire at enemies in cloud drive-bys that would soon become bonus coin stages. Also, the "jump button" was going to be "up" on the Control Pad, leaving the "A" button open for attacks.
Saved for the Sequel: Miyamoto first planned for the game to be divided between "ground" and "sky" stages. In the sky stages, Mario would fly in a vehicle (at first a rocket, and then a cloud) while shooting at enemies with the beam gun. Those concepts never made it into Bros., but vehicular shooting stages in the sky (and sea) were later included in .
Super Mario Land What Could Have Been: At one point, Nintendo of America was planning to release the game under the title Mario's Adventure, as evidenced by this early flyer for the arcade version. Who knows why they considered changing the title, or why they ultimately decided not to.