For those who have played Tomb Raider...
 

I'm thinking of getting this for the PSP but I've never played any of the games in this series. Is this game like Myst/Riven in terms of puzzles, etc or is it an action game? Are these two elements blended together? How difficult is it to play in general and on PSP for those of you that have played it there.

In my experience (which is limited, I admit), the Tomb Raider games have been more action than puzzle to me. Yes, there are puzzles along the way, but if you're not quick with your trigger, you'll have trouble even reaching most of the puzzles.

Think of what an Indiana Jones game would be like, and that's pretty much what you get.