Any idea how to beat the trial versions in the playstation game "MS PACMAN MAZE MADNESS"...??

I cant get into the goblin stage cause i only have 3 gems and in order to get 4 i have to win some timed trials of the levels.. and its not frickin easy, its close to impossible.. any hints or ideas how i can get ped one.. or however many u need to get the 4th gem to open the goblin stage??? any help would be great!!!