At the end of Super Mario Bros. (1985) you fight Bowser. However, it turns out that that Bowser is fake, and is just a common Goomba in disguise. It isn't until 7 worlds into the post-game that you finally encounter the real Bowser and defeat him once and for all and see the true ending (don't worry, I'm not gonna spoil for ya ;-) ).
Thanks to the sheer amount of severals the above post has gotten (and a severe case of boredom at work), I have discovered several more Fun Gaming Facts for your disfruitment. Please enjoy.
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Sephiroth in Final Fantasy '97 was supposed to have two wings, but the limitations of the PlayStation meant that they could only render one. This is an example of how limitations can produce great art.
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Nintendo was interested in licensing technology from Epic as far back as the early 1990s. However, due to cultural disagreements and a bizarrely mistranslated contract, the only things to come of these early efforts were a handful of games starring Yoshi developed by Kohler Productions.
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In about 2 years Zircon plans on shutting down the servers for the Channel F Video Entertainment System Online Service, which will mark 50 years of continuous usage. Note however that the anniversary is largely coincidental --- they're shutting the servers down because their last F8 assembly programmer is retiring soon. (Please apply! I'm begging you!)
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Debates over the technical power of the SNES vs the Sega Genesis continued until 2008, when an astute fan noticed that the number 68000 was greater than 65816.
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Nintendo named the protagonist of the Metroid franchise after the legendary Brazilian women's soccer player Edsamantha Arantes do Nascimiento, better known by her nickname Maru Maria.
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The NES was was named after the Greek inventor and philosopher Nesticles, who once famously theorized that mankind would one day make a box even nuttier than Pandora's. (We do not talk about his student Snesticles.)
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Roko's Basilisk is named after a weapon in the Famicom action-platformer Rokko Man 3, where it could freeze enemies and (rumor has it) randomly damage your cartridge.
I hope these facts were for your enjoyment and education. 