By Mandi Bierly
January 17, 2014 at 09:34 PM EST
Dan Power/Discovery Channel

Game of Thrones‘ Richard Madden is nothing if not a good sport. When the actor, who stars in Discovery’s three-night gold-rush miniseries Klondike (premiering Jan. 20 at 9 p.m. ET), stopped by Entertainment Weekly Radio this week, we asked him to play a game of “Hot/Cold” and guess: 1.) How many minutes the Klondike costume department dared to cover his curls and put his character — smart-turned-brooding prospector Bill Haskell — in a hat.* 2.) How many replica Iron Thrones HBO had really sold as of April 2013, when a female Thrones fans posted an ad online searching for a Robb Stark lookalike to do some sexual roleplaying in the one she claimed to have acquired.

Listen to a clip below. Madden also chats about recording the audio commentary for GoT‘s Red Wedding episode (the season 3 DVD is out next month), so spoiler alert!

UPDATE: Here’s more from Madden on the making of Klondike, which required him to dogsled, film on a frozen lake, dig a costar out of a fake avalanche in a real avalanche zone, and jump into Class IV river rapids. Listen below.

Watch the Klondike trailer:

* Bonus trivia: Guess what Madden took home from the Klondike set? “You know what’s really funny, I kept both of my hats — a blue one and a green one,” he says, laughing. “We never used the green one. But they’re really nice cashmere hats. Now I can wear them, because I don’t wear them in the show.”