Homebrew Japanese Wii U playing US games--some work, some don't. Region issue?

Klick167

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Hi, I have a Japanese Wii U running Mocha. Most of the games work fine in English--Wind Waker HD, New Super Mario Bros U work fine. Twilight Princess HD works in English after using Spiik. However, Super Mario 3D Land crashes at the splash screen regardless of region. I've also tried injecting Mario Sunshine but it crashes at the splash screen as well. Are these region compatibility issues or something else?

All of these were prepared through USB helper, with my Wii U regions set to Japanese, and US games selected.
 
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