Top 10 First Post-Launch Retail Video Games For the Sony PlayStation Portable
Source: https://en.wikipedia.org/wiki/List_of_PlayStation_Portable_games, Created on 9/5/2022
The Top Ten
"Dynasty Warriors", "Kotoba no Puzzle: Mojipittan", "The Legend of Heroes II: Prophecy of the Moonlight Witch", "Metal Gear Acid", and "Ultimate Block Party" (December 16th, 2004)
"AI Igo", "AI Mahjong", "Mahjong Taikai", and "Puzzle Bobble Pocket" (December 22nd, 2004)
"Puyo Puyo Fever" (December 24th, 2004)

"Piposaru Academia: Dossari! Sarugee Daizenshuu" (Ape Academy) (December 30th, 2004)

"AI Shogi" (January 20th, 2005)

"Rengoku: The Tower of Purgatory", and "Soukyuu no Fafner: Dead Aggressor" (January 27th, 2005)
"PoPoLoCrois" (February 10th, 2005)

"Mobile Train Simulator + Densha de GO! Tokyo Kyuukou Hen" (February 17th, 2005)

"Need for Speed: Underground Rivals" (February 24th, 2005)

"Tales of Eternia", and "Tales of Phantasia: Full Voice Edition" (March 3rd, 2005)