Game Boy World Class Service Cart – Diagnose Your Hardware Like Nintendo's Own Technicians Nintendo's authorized service centers didn't guess when a Game Boy came in for repair — they tested it. The World Class Service Cart is the diagnostic tool they used: a purpose-built cartridge that runs a structured series of hardware tests to identify exactly what's wrong with a unit. Custom cartridge, plug and play. Compatible: GB, GBC, GBA, GBA SP.
