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There are several test levels left in the game's ROM. In one of them, Iggy Koopa is actually the boss, but due to him having no coding, he dies as soon as you enter his screen.
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Within the game's data are sprites for Glad and Calm Goombas; the final game only features regular, Mad, and Sad varieties. Of note is that the Calm Goombas' sprites depict them with a pastel green palette, whereas the final game only differentiates Calm enemies from regular ones by having them stay asleep until provoked. Both unused Goomba types also feature a considerably different art style compared to the final game, indicating that the removal of color coordination for the Calm vibe occurred at around the same time as the overhaul in the game's aesthetics.
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