Aquatic Ecosystems Millionaire Game
Ecology, Populations and Biodiversity Millionaire Game
Ecosystems and Biomes Millionaire Game
Biomes and Ecosystems Millionaire Game
Municipal Sewage Treatment Matching and more
Coal Fired Electrical Power Plant
Botkin and Keller Quizzes - These are from your textbook. They're probably a bit too specific, but they're still good.