Check here for some answers to your questions.
Q: Does the cartridge work in the DSi?
Yes, the cartridge works in the DSi but you must make sure that you choose this option when ordering as it is a different cartridge type to the normal DS Lite.
UPDATE: All our cartridges without exeption are Nintendo NDS, DS Lite, DSi, DSiXL and now also Nintendo 3DS compatible. I do have to warn you about NOT updating DSi and 3DS firmware before checking with us if multicart will work with the latest kernel verion.
Buy at NDS / DSi / 3DS multi-game store >>
Q: Does the DSi cartridge work in a normal DS Lite?
Yes it does.
Q: What happens after I order?
A: You instantly receive a confirmation e-mail with your order number and invoice receipt. We also receive a copy of this and immediately prepare your order for despatch by Royal mail 1st Class Signed for.
Q: How long before I receive my order?
Once your order is received it is processed straight away and is despatched the following morning by Royal Mail 1st Class Signed for and usually arrives the next day.
Q: Where do I attach my list of games so you know which games I want to order?
A:Click on the games list tab and you will find full instructions there.
Q: Can I choose my own games?
A: Yes, you can choose from the games list and then e-mail the details to us with the order using the supplied e-mail form on the page.