"The mathematics tutorials are videos featuring mathematics teachers explaining and demonstrating how to solve mathematics problems. There are tutorial videos covering Algebra, Geometry, Trigonometry, and Calculus." (summary from Free Technology for Teachers blog)
"Gamestar Mechanic is a game-based digital learning platform designed to teach the guiding principles of game design and systems thinking in a highly engaging and creative environment.
The game and the accompanying Learning Guide are designed to foster critical 21st century skills such as systems thinking, problem solving, creativity, collaboration, digital media literacies and a motivation for STEM (Science, Technology, Engineering and Math) learning. "