LBP on the PSP is a great game. It's not supposed to take the place of the PS3 game--it's supposed to give you the LBP experience on the go. It does that very well. Also, look at the price of Killzone Liberation at retail. It was going for $9, last time I check (months ago, I admit). If you can, why not get them all. Get LBP for free and pay the $9 for Killzone.