
-=The Nintendo DS=-
Nintendo's experimental dual-screen handheld from 2004. It features a clamshell design with a standard LCD on top and a resistive touchscreen below. It also has two slots for games, one for DS game cards, and the other for GBA game paks. It's more or less a direct upgrade of the GBA, with the addition of accelerated 3D graphics, Wi-Fi, a microphone, and multi-channel audio.
When Nintendo released it, they stated that it would be a "third pillar" next to the Gamecube and Game Boy; They unveiled the Game Boy Micro at the same time. However, the DS was so successful they never made another Game Boy (aside from upgrading the screen on the Game Boy SP).

Photo courtesy of Wikimedia Commons
The original DS was succeeded by the DS Lite, which had all the same capabilities in a smaller shell, with brighter screens. The GBA slot was more shallow, so GBA game packs stuck out of the shell by a couple of centimeters. It came with a dummy game pack that sat flush. There were also accessories that were offered to fit either version of the handheld - more on that later.
The DS Lite in turn was followed by the DSi, which omitted the GBA slot, and added an SD Card slot and front-and-back cameras. It also had higher resolution screens It introduced DSiWare, which were exclusive games you could download to the SD Card. It looked identical to the DS Lite at first glance. The DSi later introduced the "XL" version, a tradition which would be carried forward to Nintendo's later handhelds.
-=The Games=-
A lot of Nintendo DS games focused on the new interaction capabilities offered by the touch screen. Among the launch titles was Feel the Magic XY/XX and WarioWare: Touched!, which were microgame collections heavily driven by touch and the microphone. Some games used the touch screen for analog input (the original DS came with a lanyard that had a plastic nub you could attach around your thumb - it approximated an analog stick, though naturally it couldn't self-center). Other games provided a more traditional handheld experience and used the 2nd screen to show maps or display information. Nintendo's main franchises found a home in the DS, as well as a large number of experimental titles that kicked off new series' of their own.
-=Some Good Games for the DS=-
- Super Mario 64 DS - An enhanced port of Super Mario 64, this added a lot of new characters and levels.
- Osu! Tatakae! Ouendan - A rhythm game that heavily used the touch screen and featured Japanese pop music. It got a sequel and a western localization called Elite Beat Agents. Today there is a free game engine called osu! that lets you download and create custom levels to play on PC.
- Phoenix Wright: Ace Attorney - A legendary series of adventure games now, it got its start on the DS.
- Brain Age - A "game" for all ages that purported to help train your memory and intelligence.
- Trauma Center: Under the Knife - A fast action surgery simulator.
- New Super Mario Bros. - A 2.5D update to the Super Mario Bros. concept.
- The Legend of Zelda: Phantom Hourglass - A 3D continuation of the handheld-style Zeldas that used touch input to good effect.
- Final Fantasy IV - This remake of the SNES classic featured all new 3D graphics and voice acted cutscenes.
- Pokémon Diamond/Pearl - The 4th generation Pokémon game, it brought in 2.5D graphics, the Pokétch PDA, online battles and trading through the GTS, and connectivity with Pokémon Coliseum on the Nintendo Wii. Notably, it could read save data from the GBA slot, so you could transfer Pokémon from FireRed, LeafGreen, Ruby, Sapphire etc. through the Pal Park.
- Etrian Odyssey - First of a long series of dungeon RPGs, this let you use the touchscreen to draw your own maps.
- Guitar Hero: On Tour - This came with a Slot 2 accessory that gave you a grip with buttons so you could kinda sorta play like the full size Guitar Hero games. You could order a DS Lite sized version of the accessory if you wanted.
- Animal Crossing: Wild World - This sequel to Animal Crossing introduced Wi-Fi multiplayer and online capabilities that really elevated the game.
- Pokémon SoulSilver/HeartGold - Enhanced remakes of Pokémon Silver and Gold, these brought the games forward to Gen 4. They also came with the Pokéwalker, a device that would wirelessly download one of your Pokémon so you could carry it with you like Nintendo's previous Pokémon Pikachu device.
So! Post about your favorite Nintendo DS games and experiences here.