North America * 7 Wonders of the Ancient World * AniMates * Backyard Basketball * Digimon World: Dawn * Digimon World: Dusk * Juiced 2: Hot Import Nights * Master Jin Jin's IQ Challenge * MySims * Namco Museum DS * Nancy Drew: Deadly Secret of Olde World Park * Sonic Rush Adventure
Europe * B-17: Fortress in the Sky * Cake Mania * Drawn to Life * MySims * The New York Times Crosswords * Prism: Light the Way
Japan * Deltora Quest: 7-tsu no Houseki * Elemental Monster * Gachapin Nikki DS * Katekyoo Hitman Reborn!! DS Flame Rumble Kaien Ring Soudatsuen! * Kyouryuu Ikusei Battle RPG: Kyouryuu Monster * Sankei Sports Kanshuu: Keiba Ryoku Nintei Shiken: Baken DS * Simple DS Series Vol. 22: The Zero-Yon * Shinya * Tanoshii Youchien: Kotoba to Asobo! * Uwasa no Misu-Kun!! Natsuiro Striker
Australia * Brain Buster Puzzle Pak * Chronos Twins * Custom Robo Arena * Drawn to Life * Life Signs * MySims
Namco Museum could be fun. I don't really care about the rest of them, though.
... Any of them could qualify, but I preferred the PC version despite its late-80's graphics. It was the pioneer game for the Koei "system" of historical games that I've enjoyed so much over the years. Koei's finest: