Well, when I open the Wii U menu, I click on the game but the most hated message ever pops up, "The disk might be dirty".If the disc boots, try replacing everything with cafiine. It should load everything from your PC instead of your disc.
Same problem happened with my Mario Kart 8 and Super Mario 3D World disks.
Happy day guys, my 3 and only Wii U disks are now broken