Most Wii games use 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.