Call of Duty Black Ops [SC7x52] (Region Free)
Remove 2nd Host Header [IPG]
0423C954 41414141

Call of Duty Modern Warfare Reflex [RJAx52] (Region Free)
Remove 2nd Host Header [IPG]
041B838C 41414141

Call of Duty Modern Warfare 3 [SM8x52] (Region Free)
Remove 2nd Host Header [IPG]
04238C74 41414141

Rock Band 3 [SZBx69] (Region Free)
Remove 2nd Host Header [IPG]
048E3B20 41414141

The Beatles: Rock Band [R9Jx69] (Region Free)
Remove 2nd Host Header [IPG]
048D6934 41414141

(Update 15th July 2020: Nintendo made a server-side change at around 9:00 PM BST that broke the previous codes)