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Nintendo DS Games I Already Have (49 titles; 14 from Nintendo)
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Pac Pix (First Game I bought)
Lunar Dragon Song
Castlevania: Dawn of Sorrow
Electroplankton (First Nintendo produced title I got)
Tetris DS 
Lost Magic
Brain Age: Train Your Brain In Minutes A Day
Big Brain Academy
Magentica
Break'em All 
New Super Mario Brothers
Cooking Mama 
Magical Starsign (Magical Vacation 2 in Japan)
Final Fantasy III (The Famicom one; not the American version of Final Fantasy VI)
Children of Mana
True Swing Golf
Castlevania: Portrait of Ruin
Etrain Odyssey
Luminis Arc
Hoshigami Running Blue Earth Remix
Dragon Quest Monsters: Joker
Front Mission First
Final Fantasy IV DS 
Final Fantasy Tactics A2
Dragon Quest IV DS
Castlevania: Order of Ecclesia
Disgaea DS
Rondo of Swords
Etrain Odyssey II
Pokemon Pearl 
Valkyrie Profile: The Accused One
Luminous Arc II
Blue Dragon Plus
Fire Emblem: Shadow Dragon
Dragon Quest V DS
Chrono Trigger DS
Sonic Chronicles Dark Brotherhood
Sands of Destruction
Tales of Nostagalo
Suikoden Tierkreis
Dragon Quest IX: Defender of the Skies
Pokemon Soul Silver
Kirby Superstar Ultra
Dragon Quest VI DS
Lufia DS
Dragon Quest Monsters Joker 2
Final Fantasy:  The 4 Heroes of Light
Golden Sun: Dark Dawn
Glory of Heracles

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Nintendo DS Games I Want To Get (32 titles, 1 from Nintendo)
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Nanostray
Iron Feather* 
Contact
Cooking Navi 
Point Blank DS 
Tales of Tempest*
Digimon World
Izuna: Legend of the Unemployed Ninja
Heroes of Mana
Final Fantasy XII: Revenent Wings
Rune Factory
Rune Factory II
Y's Stragedy
Remin Delight*
DS Curling (Why not?)
Tales of Innocence*
Balls of Fury
Summon Night 1*
Summon Night 2*
Shining Force Feather*
Phantasy Star Zero
Y's Book 1 & 2
From The Abyss
Front Mission 2089: Border of Madness
Summon Night: Twin Age
Tales of Heart*
Tactical Guild*
Tecmo Bowl: Kickoff
Saga 2 DS*
Saga 3 DS*
Luminous Arc 3*
Entrain Odyessy 3

*- Yet to be announced for release in North America.