We already knew Xenoblade Chronicles X was a huge game, there was no denying it as even the latest trailer suggested it, though I don't think anyone expected just how big the game is. Monolith Soft has revealed that Xenoblade Chronicles X is so big that it almost takes up all the available storage space on the Wii U game disc, and it pushes extremely close to the storage limit. It was even revealed at one point Monolith even considered using more then one disc for the game.
All this information came about from Monolith Soft's latest Japanese Xenoblade Chronicles X Twitter update, which was posted by producer Shingo Kawabata. His full comments are posted below.
Xenoblade Chronicles X is using up most of the space on the Wii U disk. It’s really, really close to the storage limit. (To the point that at one stage we were considering using more than one disk for the game). To enjoy playing, the enormous seamless map must load quickly (which was achieved through the hard work of our programming division), but we had help from Nintendo proper implementing a further improvement to what we had. I believe we’re going to reveal the details of that on the official page in the future, but to people considering purchasing the packaged version of the game, as one of the game’s developers, I highly recommend you make use of this improvement.
Just in case you are curious Wii U discs offer up to 25GB of space. So this really can make you question just how big this world is and just how close the developers came to exceeding the limit, I imagine 24.9GB of space based on extremely lose.
On a side note if this is the data taken up by Xenoblade just how big is Zelda going to be, I imagine it will be pushing it also.