Level7: Rockstar to release a new Grand Theft Auto game for DS was cocky. They had been able to convert GTA 1 or 2 to the format to speed up the process. However, Rockstar Leeds got to do a completely new game, which was also really good. But it has flopped. The seats are not even on the list of the hundred best-selling games for the console.
To make a PSP version, however, as smart as it is safe. The PSP is GTA games a success and the current situation is both Liberty and Vice City Stories on the top three of the best-selling games for a format.