Question about Tetris DS and the DSi.....

[holy_kimeramon]

Ok, I have a friend that has a DSi and can play Tetris DS on it perfectly fine, no glitches or anything, but here i'm finding copies of Tetris DS on Ebay that show that it can't be played on the DSi, only DS and DS lite......are these copies on Ebay fake copies or is there just some Tetris DS games that can't be played on DSi? Thanks for any help on this.....

P.S. http://cgi.ebay.com/New-Nintendo-DS-...d=p3286.c0.m14 is a link to one of the many games I found, just for reference....

[Neo Matrix]

All DS games are supposed to be able to work on the DSi. I don't know where people have been saying they don't. I'm not 100% sure whether the DSi looks for region though, so I don't know for sure if a UK game would still work on a US DSi...