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Maybe this is why LEGO City: Undercover requires an external hard drive in order to initiate a download from the eShop.
The new Wii U game seems to take up a massive amount of space. LEGO City's file size clocks in at 22GB or so - an unpredictably high figure.
Of course, you could always opt for the retail version of LEGO City. You won't have to worry about hard drive space if you choose this option.