I have just worked out how to put more than one BLZ file on the same MMC. I may be a bit late with this info as I have had my NGAGE for 5 months so this may be old newas. If not then enjoy!
1st format ur MMC and install a BLZ as normal. Start the game then exit. Now connect to the pc via the cable and drag the folder containing the game from "System/Apps" on MMC to your desktop. Once copied delete the folder contain the game from "System/Apps" on the MMC. Now do the same again with another BLZ file. Once you have done this with all your BLZ files drag them from your desktop back to "System/Apps" on the MMC. Remember to start the game before deleting from the MMC as this is what seems to make the process work.
CTID.
The Kippaxkid
Bookmarks