Klondike: Rush For Gold is an online game from the Virtual Museum of Canada. It’s in the “Choose Your Own Adventure” genre, and the player puts him/herself in the position of being part of the Gold Rush frantically heading to the Yukon.
It’s a nice game, though it’s not animated and has a fair amount of text. However, it should be accessible to Intermediate English Language Learners.
I’ve placed the link on my World History page under The Beginning of Modern World Problems.