There are some good recommendations here. You might also be interested in TIS-100. http://www.zachtronics.com/tis-100/ http://www.zachtronics.com/tis-100/ Yo

There are some good recommendations here. You might also be interested in TIS-100. http://www.zachtronics.com/tis-100/ http://www.zachtronics.com/tis-100/ You solve coding puzzles but in a very limited retro environment.