LEGO City: Undercover download requires an external Wii U hard drive
If you intend to download the digital version of LEGO City: Undercover for the Wii U, you may want to pick up an external hard drive. Early reports (via Eurogamer) indicate the open-world LEGO game weighs in at massive 22GB. This has led to the publisher warning potential buyers.
As acknowledged on Nintendo's support page, the basic 8GB Wii U console has just 3GB of free space after installing the mandatory system software. Those who own the 32GB Deluxe Set have approximately 25GB of free space available, so while it is possible to squeeze the game onto it, you may have to clear some space if you have previously downloaded other software or apps.
Heading into the Wii U's launch, the lack of storage space was one of the primary concerns for those who prefer digital. Nintendo recommends "using a hard-disc drive (HDD) with a dedicated power source (i.e., using an A/C adapter)." For a more specified list of supported USBs, check out Nintendo's support page.