#1 - 'Do not sleep while playing'
While a lot may be lost in translation here, this Japanese "player's guide" for Super Mario Bros. 2 (spotted on the Ultra Scrub Quotes IV's twitter) still paints an vivid picture of a different time in videogame history. Most of these tips are more focused on teaching us to behave like civilized children and less on how to win at videogames, though there are still a few nuggets of gold to be found here.
#7 is applicable to pretty much any situation.
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