Did You Know Wii U Discs Hold 25GB of Memory?!

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geddie221 said:

Smash Bros. Brawl had some loading issues because it was the first Wii game to use a dual layered DVD (8.5GB). Metroid Prime Trilogy was the second and last dual-layered game on Wii. 

Metroid Other M, Xenoblade, and The Last Story were all dual layered and came out after Prime Trilogy.