If you want to go in further, you'll need to take a harder test... Makes perfect sense, no? So what do you want? Do you want the new test?

Then go to [map 270020400] and defeat the Chief Qualm Guardian. If you defeat 300 of them, I will grant you permission to go beyond that.

That's too hard for you? That's too bad then. I guess that's just your limit.

You've defeated 300 Chief Qualm Guardian. That's amazing. I will grant you the permission as promised.

Go on. You should be able to go up till [map 270020500]. As you may have guessed, you can't go beyond that. If you want to go further... you'll have to take a new test.

As the representative of Rhinne, the Goddess of Time, I grant you permission to look back at your 5th regret.

You haven't defeated 999 Chief Qualm Guardian yet. I don't think you are strong enough to walk against the flow of the past yet.