Many people have heard of Rube Goldberg and the extraordinarily complicated devices he would create to perform what would ordinarily be a simple task.
I’ve had students design their creations on paper as part of learning about Science, and developing a virtual one only adds to the educational value. I’ve posted a link to the game on my website under Word and Video Games, along with a “Walkthrough.” However, there’s a lot of language development that can happen even without English Language Learners using that walkthrough. It’s accessible to Early Intermediate English Language Learners.
I also have a link to the game, along with links to other Rube Goldberg sites, on my mainstream Science page under “Rube Goldberg.”