MINNEAPOLIS (WCCO) – It’s like a real life treasure hunt, and the clues are being tweeted, and the prize is Justin Bieber.

“He tweeted about it, and people said they watched him go in there,” Molly Hafner said.

Hafner and her friends are camped out at the Grand Hotel in Minneapolis, and they are all going to the Justin Bieber concert at the Target Center Saturday.

Joe Schultz paid $223 for a VIP ticket and is planning to meet him.

“Without a doubt,” Schultz said. “I got a marker, and he’s going to sign me, and I’m going to go right from here and get it tattooed.”

He and his friends are following tweets today, hoping to see Bieber up close.

“We have been following his tweets, and taking hints, and one of his crew members tweeted. Then he tweeted ‘gym’ and then deleted it right away,” Maddie Linder said.

They thought Bieber was maybe working out at Life Time at the Grand, and were ready with cameras if he came out.

“We saw Justin Bieber’s grandparents, and we took a picture of them, and we said ‘Hi,’ casually, and they said ‘Hi,’” Kelsey Marier said.