GT HD is supposed to be a taste test of what is to come from GT on PS3 and it successfully does this but it's not going to last you more than a few hours. On offer is one track and ten cars with only one car available initially, where as more become unlocked as you beat the various track records with each car. Generally, even without the driving aids on, you will unlock most cars within one lap of the circuit and then it just becomes a piece of software to show your PS3 off to mates.