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Would scratch be something that fits the bill? There is an entire free curriculum and it involves the students in making all kinds of interesting/fun things including games near the end of the curriculum. Also, depending on how you use it, the lego robotics stuff can involve students in making all kinds of interesting robots. I'm not sure if you are looking for programming specific stuff only? There are lots of other games out there for other topics too. Here's a favorite of mine for natural selection. (It's the last button on the bottom right, then click the right pointing arrow, there will be two of them)