Under the Knife 2's only flaw is that it feels a bit light on content, offering only 38 operations that take a few minutes each to play through. You won't necessarily complete them all first time, of course, but even allowing for failed attempts and lengthy cutscenes it shouldn't take you more 15 hours or so to beat the game. Finishing the game does grant you access to "confidential" operations, but these are set on extreme difficulty, leaving those who shied away from the hard setting woefully unprepared for the challenges ahead.
Even with these bonus operations the game still feels padded, containing entire episodes without operations that amount to little more than lengthy dialogue filler. There's some replay value at least, since the ranking system encourages you to repeat past surgeries to increase your score. All in all, Trauma Center: Under the Knife 2 successfully blends a creative medical theme with bizarre but fun puzzle gameplay to create an addictive treat.