Here's what happens when you put a 3DS cartridge in a DSi
As you likely noticed, 3DS cartridges are just one good filing away from being able to fit in a DSi. To save you the trouble, we took a file to our copy of Madden Football, and we've got a detailed walkthrough of exactly what happened after the break.
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I'll save you the click... nothing happens
Is this supposed to be surprising?
It'd be like putting a PS2 disc into a PS1.