IGN review Tenchu: Shadow Assassins:
"The PSP version of Shadow Assassins has scored lower than its nearly- identical Wii predecessor -- content-wise, the two are the same -- for a couple of reasons. First, it obviously doesn't look quite as good as the big-screen version, running in 480p. Second, there are newfound load times before, between and after levels that really break the momentum. And third, you lose something when you go from the gesture-based controls to the analog stick, particularly where duel mode is concerned.
Still, though, Tenchu is a fun PSP effort so long as you think of it as an all-new take on the franchise. The levels you play through are self- contained puzzles and not wide-open ninja-filled action-fests. If you prefer stealth to pure swordplay, you'll surely appreciate this approach."