To fix a Wii disc that cannot be read, follow these steps:
1. Check for visible scratches or dirt on the disc.
2. Clean the disc using a soft, lint-free cloth, wiping from the center to the outer edge.
3. If there are stubborn stains or dirt, dampen the cloth with isopropyl alcohol and gently clean the disc.
4. Let the disc air dry completely before inserting it back into the Wii console.
5. If the disc still cannot be read, try cleaning the Wii console's disc drive lens with a lens cleaning kit.
6. In some cases, the problem may be a faulty laser lens. If cleaning doesn't help, consider replacing the laser lens or contacting Nintendo for further assistance.
By following these steps, you can often resolve issues with unreadable Wii discs and restore gameplay functionality.