PSP3d.com have managed to get Tetris running on PSP firmware 2.01, using Fanjita?s work (and others) on the Hello World code for the GTA: Liberty City Stories savegame exploit.The installation is the exact same as the Hello World code, simply copy the correct savegame folder to \PSP\SAVEDATA. For US versions, the folder is ?ULUS10041S0?, for EU versions the folder is ?ULES00151S0?.
Download it here