What Was the First Nintendo 3DS Game? (Launch Titles & Pre-Installed Apps)
There is no single “first game” because the 3DS launched with multiple simultaneous titles on February 26, 2011 (Japan) / March 27, 2011 (NA) / March 25, 2011 (EU).
Launch Titles (Retail)
Super Street Fighter IV 3D Edition
Pilotwings Resort
Nintendogs + Cats (3 versions)
Ridge Racer 3D
Steel Diver
Combat of Giants: Dinosaurs 3D
Rayman 3D
Asphalt 3D
Madden NFL Football
The Sims 3
Pre-Installed / System Software
Mii Plaza (StreetPass Mii Plaza): Pre-installed app with mini-games (Puzzle Swap, Find Mii). Technically the first playable software on every unit.
AR Games: Pre-installed, uses AR cards.
Face Raiders: Pre-installed face-shooting game.
Nintendo Zone, Activity Log, Notifications, System Settings.
Notable Near-Launch
Kid Icarus: Uprising — Announced for launch, delayed to March 2012.
Professor Layton and the Miracle Mask — Launch in JP, later elsewhere.
Answer depends on definition:
First pre-installed: Mii Plaza / AR Games / Face Raiders.
First retail release: Any of the 10+ launch titles above (region-dependent).