Development files for Mario Kart 64 contain an early version of the game's item roulette graphics, which reveals some items that were scrapped during development, including:
-a Yoshi egg, which was usable only by a CPU opponent Yoshi in Super Mario Kart, and then was later added in Mario Kart: Double Dash with different mechanics
-a group of six marbles with unknown properties
-the Cape Feather from Super Mario Kart, and then later, Mario Kart 8 Deluxe
-a 10-ton weight, also with unknown properties.
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I know everyone has done this by now but it's always been my favorite MK track so I had to do it too! Please appreciate this nice video version (sound on!)