18 Essential Landmark Titles Every Gamer Must Play

6. Super Mario Bros.

It's difficult to classify exactly why Super Mario Bros. is such a beloved game. It consistently finds itself at the top of 'History's Greatest Games' lists, and rightfully so, despite being an admittedly very simple side-scrolling adventure. Perhaps it is its simplicity that makes it so endearing, or maybe it's the fact that it's - quite simply - just so much fun. It offers endless replayability, and the straightforward nature of the game means that it can be picked up and played at a moment's notice just to kill time or for hours. The original of the franchise, Super Mario Bros. has spawned a long, long line of games, adaptations and merchandise, meaning even those who have never played a video game in their lives know his name, face and "It's a'me!" catchphrase.