So we already know that the NTR on the DS game card is used to identify or differentiate that that game is for NDS and DSL game consoles. and as stated here ( follow link ) we also knows that the TWL serial is used for the game cards that contain extra features compatible with the DSi and DSi-XL/DSi-LL consoles. Independently that for each game console was used a diferente serial number for each console, cartridge games only had 2 diferent serial number for, one for the DS line, and another for the DSi line of console. Warning: Spoilers inside! Nintendo DS (NTR-001) and Nintendo DS Lite (USG-001) NTR serial number for DS line compatible hardware/console. Preview, Demo and Distribution cartridge sometimes have a DIS serial before the NTR one, suppose DIS stands for Distro/Distribution. Nintendo DSi (TWL-001) and Nintendo DSi XL (UTL-001) TWL serial number with extra features for DSi line compatible hardware/console. DSi Exclusive cartridges come always in a white color as the one above on the right. But with the release of the 3DS game cartridges have a new 3-letter Serial Number : the LNA tag ... what does it means ? As discussed here, we know that the NTR is NITRO, and that TWL stand for either TWELVE or TWILIGH, in both cases the 3-letters Serial is/has been related to the Console Codename, in this case LNA would be Related to the 3DS codename. Is LNA the Codename of the Nintendo 3DS, and if it is, what does LNA means ? What is the Nintendo 3DS console Serial Number, is it LNA-001 ?? Questions, just questions Pictures of the 3DS cartridge taken from NWR : Nintendo World Report?