5. There's a fourth piece to the Triforce

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We know that "Triforce" has "tri" in the name. "Tri" meaning three, for three pieces of the Triforce, three corners of a triangle, and the three corners of those three Triforce pieces that make up the larger three-sided triangle of the whole Triforce. Zelda, by its very nature, has more threes in it than the video game called "Threes." There's no way there could be a fourth piece to what is essentially the Threeforce. It would make no sense.

Except it totally does.

Look again. There is absolutely a spot for the fourth Triforce, dead center. That hole is the perfect size for another piece, albeit upside-down. Just check out Link's shield in Ocarina of Time. 

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On the top of the shield you can see the Triforce, but at the very bottom you can clearly see a fourth piece. As I've deftly illustrated utilizing my skills as a certified MS Paint instructor, that piece perfectly matches what's been "missing" from the Triforce all these years. As the years have worn on, this line of thought has become known as the Tetraforce Theory.

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The Tetraforce Theory is bolstered by the prevalence of things that come in fours in the Zelda games. There are four Light Spirits in Twilight Princess, the Four Giants who prevent the moon from crashing into Termina in Majora's Mask and of course, there's also the Four Swords games to contend with. In addition to the three goddesses that create the three initial pieces of the Triforce as shown in Ocarina of Time, many have suggested that the fourth goddess could be the sorceror Vaati or the Great Fairy of Kindness. 

It's even been said that the fourth goddess could be Princess Zelda herself; or as she's called in Wind Waker: Tetra.

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Series creator and Nintendo demigod Shigeru Miyamoto has come out and denied the Tetraforce Theory, but the guy has been known to lie before. Personally, I wouldn't trust anyone who produced Urban Champion.

 

4. The bad guys in Twilight Princess also created Majora's Mask

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Majora's Mask is such an oddity. In almost all of the other Zelda games, you're guaranteed to get your Ganondorf and your Triforce and that incredibly annoying beeping when you have one heart left -- but Majora stands on its own. It's really rare for a major console Zelda game to have nothing to do with Hyrule; it's like one of the quirky handheld Zeldas writ large. 

That's not to say Majora's Mask doesn't have any links to the more traditional entries in the series. You can spot some clear references to MM in the character designs of Twilight Princess.  

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On the top-left we have TP villain Zant, whose festive scarfbib bears a design that evokes Majora's creepy eyes. Then there's Midna's mask, otherwise known as a Fused Shadow (created by the villainous Twili) -- that pupil is unmistakably Majoraesque. Maybe most interesting is the unused, megahairy version of Twilight Princess' Ganondorf, who has the face of Majora plastered across his chestplate. 

The crazy part is this totally works in-canon, too. According to Nintendo's "Fine Nerds, Here's Your Stupid Official Timeline," Majora's Mask and Twilight Princess take place in the same dimension.

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That's not all. In Twilight Princess, it is revealed that the dastardly Twili were once called the Interlopers, a race who were sealed in the Twilight Realm after trying to get at the Triforce. Compare that with what the Happy Mask Salesman says about Majora's Mask:

"The mask that was stolen from me... It is called Majora's Mask. It is an accursed item from legend that is said to have been used by an ancient tribe in its hexing rituals. (...) According to legend... the troubles caused by Majora's Mask were so great... the ancient ones, fearing such catastrophe, sealed the mask in shadow forever, preventing its misuse..."

The existence link between Twilight Princess and Majora's mask seems almost undeniable. Now if we could just figure out what the hell Mario is doing in Hyrule...