To be able to run, you must first have some kind of "memory card". I have, and can personally vouch for, DSX. You can read all about my experience with it in earlier posts..
1. Lemmings - First off is Lemmings! This (open source) version of Lemmings for NDS is a complete rewrite of Lemmings with close to 300 of the original levels. Installation was easy - and no dldi patching was necessary for DSX. Download here.
2. Doom - This version of Doom, called "DS Doom", even have multiplayer support using wireless. This version does not need dldi patching for DSX. But you do need Dooms WAD-files (shareware is fine). Homepage here.
3. Day of the Tentacle - Yes! The great adventure games from Lucasarts can be played on the NDS using a port of Scummvm. Scummvm is just a new engine, so you still need the data files. A whole range of adventure games can be played (Monkey Island 1 & 2, Sam & Max hit the road, Simon the Sorcerer 1 & 2, ..). Download the NDS port of Scummvm here.
4. Hexen - Another old classic FPS game, based on the Doom engine. Fetch it here.
5. Quake - Yes, running Quake at full speed. Quite a nice port considered the NDS's 4MB of memory. You'll need the shareware version of the game file (PAK0.PAK) and/or the full game (PAK1.PAK).
Other games I would like to see ported to NDS, are from the Ultima series. Specifically Ultima 7 and 8 and Ultima Underworld 1 & 2. Great, great games! And since I've mention Lucasarts games, playing X-Wing and Tie-Fighter would also have been fun - which the NDS should be more than capable of. When it comes to Ultima 7, the Exult project have made a comment on porting to the NDS. - Oh, and not to forget Dungeon Keeper, Diablo, ...
Now, if only I had some more time to play games!
