That's right, a puzzle. Actually, in general I think the puzzles are the hardest part of this game. By the time you've beaten the game, you've probably memorized a lot of tricky routes.
But gods, the most annoying part of that game, was that stupid vase and putting it back together. The bottom ones aren't so tricky. It takes a few seconds to realize you need to give the bottom ones and extra scoot as to give room for V. Take the first one, scoot it a little extra to the left, take the second one, scoot it a little further, drop V and move them into place. A little tricky but not super tricky. Then comes IV and then I, if I remember correctly. But then OH GOD, the two at the top.
That last part is for people who know what they're doing with Stella. You have to be very careful of where you aim that fire and be able to move both blocks while they're up there.
I'm probably going to be mocked by people saying "no, you're dumb muscle like Arche. Anyone who uses their brain finds it easy". Well yeah. But the game itself isn't super hard. But that was definitely, I think, one of the hardest spots in the game. In my opinion at least.
Heck, the whole tower, or rather both towers are kinda annoying since both of them require leaps of faith to find doors to progress and loads of enemies that use confusion spells. But that was definitely a climax. That was like "ugghhhh", I knew what I needed to do fairly fast, but hitting the vines just right and moving the blocks was rather cumbersome.