Halo DS was cancelled due to issues regarding the license.
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No, sadly it's not.
You can download Halo Zero from http://games2bee.webs.com/apps/blog/.....
Halo isn't available for Sony consoles.
You can't 'add/download' games to the DS lite.
You can download unlimited, full version Nintendo DS and DSi games and easily transfer them to your DS / DSi using: http://www.squidoo.com/Download-DS-Games