Unlock Surprise Mode?

While I was playing in the ScareScraper, I noticed someone's room had Surprise Mode. I don't have it as an option, but can someone tell me how I can unlock it?

Solution 1:

To unlock surprise mode you have win one of each type of ScareScraper (Polterpup, Rush and Hunter) on any floors on any difficulty.

From the wiki.

It is unlocked by completing the other three modes on any difficulty/floor amount at least once.

Solution 2:

What you need to do is complete Hunter, Polterpup and Rush mode at least once on any difficulty. I would recommend that you play each mode on the easiest difficulty to unlock Surprise Mode much faster.

I hope this helped!