Hmm, I'd rate Tornado Outbreak at least a 2, possibly a 3. There are two highly difficult trophies in the game, with them being the one that requires you to absorb 100 Flyers at once (only 100 in a stage) and the other involves unlocking all of the bonus content. There are various objectives for unlocking bonus content, such as getting all Fire Flyers in a stage (3 areas per stage), finding all collectibles, getting a gold on the Vortex Race (not hard) and getting a gold medal for your overall score.
The very last one is very tough, since it requires you to get high combos (basically collecting the Fire Flyers in a stage without absorbing them completely; you get to "hold" them at your side) with the Flyers. Of course, it's not easy since you need to be a certain size before you can destroy objects with the Flyers in them (think Katamari for those who've played it). Here's a video that shows the Flyer gameplay if you want to check it out (that part starts at around 5:40 or so):
http://www.youtube.com/watch?v=fGArWJwYkys
What makes it tough is that the score requirement is set kind of high in order to get the gold medal for that part. I think it took me upwards of two hours sometimes to do one zone (of the three), in order to get a high enough score so I could get the gold medal. It definitely takes some planning and know-how of the game to get it done right. Plus, according to www.ps3trophyguide.com , only 3 other people have the plat and the game's been out for about a month and a half.
