Why won't my son's Nintendo DS read any games?

The Neon Advance plays original GameBoy Advance carts, and retains the original DS slot My favorite has to be this one, which features a

How to Fix DS Cartridge Slots! Repair DS and GBA Readers & Games! #nintendo #dslite

ds slot GameBoy games Similarly, and following along the chain of progression, the original Nintendo DS offered GameBoy Advance backwards compatibility with a

ds lite gameboy slot It says Nintendo DS on the adapter On one end, it looks like a Game Boy Advance cartridge On the other end, it has a slot where