If you’re interested in purchasing the downloadable version of Mario Tennis: Ultra Smash, you may be wondering how much space it requires. The download size for the upcoming sports game is 888 MB, according to Nintendo. Depending on how much space you have left on your Wii U, you may need an external hard drive to download the game. Mario Tennis: Ultra Smash is set to launch on November 19 for Wii U. The downloadable version will be available via the Nintendo eShop, and you can pre-order it now.