I just started playing today, and played through the first few levels, and unlocked the Challenge for Sharptstone Keep. When I click on the Adventure button, I see the options for Explore and Challenge. The Challenge button is gently pulsing, and reacts as normal. But when I click the Explore button, nothing happens. I’m not sure what if there is some timer that I’m unaware of, or if the game is malfunctioning?