The namesake of the site.
Super Mario All-Stars is a compellation of the original Super Mario Bros. 1, 2, and 3 for the NES. It also includes the Japanese Super Mario Bros. 3, which is known mainly through-out the rest of the world as "The Lost Levels."
All the games have enhanced 16bit graphics and the ability to save your progress, and items in SMB3. The game sold very well, and was updated later on with Super Mario World included.
Description for The Lost Levels:
This is the true sequel to Super Mario Bros. It looks and plays much like the original. The graphics had been updated and enhanced, and there were additions, such as the poison mushroom which would come out of bricks and coin blocks and kill you. The game was also longer, had more puzzle aspects, and was much more challenging. This was the reason the game was never released as is for the NES. Nintendo thought the game was too challenging for players outside Japan. So we ended up getting a completely different game as our Super Mario Bros. 2

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Screenshots:
Super Mario All-Stars: SMB
Super Mario All-Stars: SMB 2
Super Mario All-Stars: SMB 3

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