Power-ups are to the Super Mario franchise like items are to The Legend of Zelda: intangible and plentiful. So when one Super Mario fan set out to create pixel art of every power-up in the franchise, they were in for a lot of work as there are dozens to depict.
Back in the original Super Mario Bros., the power-ups at the Italian plumber's disposal were a bit more streamlined. Players could get a Super Mushroom to grow in size and take an extra hit, a Fire Flower to both grow and shoot fireballs, or the Star to become invincible for a short period of time. As the series would progress though, and especially from 2D to 3D, with every new title it seemed like there were new power-ups being introduced. Many of these power-ups are uncommon in the greater Super Mario series like the Gold Block from New Super Mario Bros. 2, that gave Mario coins as he sprinted.
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Reddit user BausOfBacon has painstakingly created pixel art of every Super Mario power-up in the style of Super Mario Bros. 1. There are 52 sprites in total (51 when not counting the blank space for Super Mario 64's Vanish Cap), all of which fit inside the 32 by 32 pixel count used in the original Super Mario Bros. The power-ups of Super Mario Galaxy are very prominent in BausOfBacon's work, those being Spring Mario with his coil body, Bee Mario whose overalls alternate brown and yellow, the self-explanatory Boo Mario, and the entirely light blue Ice Mario.
BausOfBacon speaks a bit about the work that went into this project in the comments of their post. According to them, there were a handful of really easy power-ups to make, them being the Super/Rainbow Star, the Ice Flower, and the Super
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