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Didn't realize how hard MGS4's Disc Swap joke hit until I backed it up
(programming.dev)
Vintage gaming community.
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Most Wii games used single layer DVDs, but it had a couple Dual-Layer DVD games, obviously still a lot smaller than Blu-ray. Including Smash, Xenoblade, Metroid Prime Trilogy, and also that Metroid game that shall not be named.
It was not as transparent because it required a system update to support those... and because some Wiis with faulty disc drives had to be replaced because they couldn't read them at all. I had to send mine to support.