I learned about the Water Alert game from EFL Classroom 2.0. It’s sponsored by UNICEF, and in it the player has to respond to various water crises that residents of the Third World have to face.
Text and audio support is provided, and the language used is fairly simple. It certainly would be accessible to Intermediate English Language Learners.
I’ve placed the link on my World History page under Toward The Twenty-First Century.
As I’ve mentioned before, section titles on that page are the same as the ones in the book we use. And, yes, it’s obviously a little old if the last chapter is called “Toward The Twenty-First Century.” But it’s a good book accessible to English Language Learners.