One of the things Nintendo promised in The Legend of Zelda: Breath of the Wild was freedom, and freedom is what they delivered. In fact, one person wanted to put this to the test by doing something that they mentioned during a Switch presentation, carrying a boulder from the start of the game to the end of the game.
PupperMaster9 puts the claim to the test by leveling up Link to an absurd degree and then going back to the start of the game at the Shrine of Resurrection.
He uses the time powers and the timed explosive to push the boulder into various directions.
Rinsing and repeating using Stasis and the remote bomb is how he gets the boulder from the start of the game to Hyrule Castle. He notes that you need to stick close to the boulder, otherwise it will despawn and you'll have to restart at the plateau. Additionally, if a boulder sinks too low into the lake in Legend of Zelda: Breath of the Wild it will also despawn.
Along the way, Link slowly blasts the boulder across the plains toward the castle. He has to fight skeletons, goblins, and several Guardians along the way. Thanks to having a lot of high-end, top-grade equipment, he's able to get into Hyrule Castle.
Things don't get any easier inside the gates, though. More Guardians await and there are a lot of pitfalls and obstacles blocking the way. Nevertheless, as showcased in the video, he manages to make it to the gate, into the courtyard and up the incline toward to the tower where Calamity Ganon resides.
Obviously, if you watch the video there are spoilers showcasing the inside of Hyrule Castle, so if you don't want that part of Legend of Zelda: Breath of the Wild exposed, you might want to stop watching once he gets through the gate.
There are a lot of obstacles in the way, though, especially in the form of Ganon's corruption littering the floor. After getting through the blockades and killing more of the guard towers, he eventually makes the steep and treacherous climb up the destroyed pathway.
Once inside, PuppetMaster9 snaps a photo with the boulder inside the room where the Ganon fight takes place, proving that you can actually take a boulder from the start of Legend of Zelda: Breath of the Wild to the very end of the game.
This proves that what the Nintendo developers had mentioned about the game is actually true... of course, it'll take you nearly a whole hour just to get the boulder from the start of the game to the end of the game.