web browser does not show image for sleuth game?

My teacher gave me this assignment for something called a sleuth game. I go to the website here: sleuth game

basically I go to this website and I download the puzzle and before I start working on it I try to open it in the browser yet all the web browsers firefox, Edge, Brave all of them show the same thing:

web browser hung on loading not doing anything

please help if I don’t work on this damn thing, I’ll fail