Though it trips up a bit in its Career mode, Tony Hawk's Pro Skater 3+4 still manages to deliver a marvelous game of skate.

The short answer is no, there are no old-style input cheats for Tony Hawk's Pro Skater 3 and 4. The days of typing in a code or tapping away buttons in a special sequence now seem to be a distant memory (sigh) - however, there is still a way to slightly alter your runs to make them a bit easier and these are called assists.