Not really a full "game", but I found this picture-based Morse code trainer from Experiments with Google a fun and easy way to learn Morse code: https://morse.withgoogle.com/learn/
This nand2tetris-inspired game is really great too -- it was very hard to resist and not finish it! [0]. It was posted as a Show HN [1] about a year ago.
Not really a full "game", but I found this picture-based Morse code trainer from Experiments with Google a fun and easy way to learn Morse code: https://morse.withgoogle.com/learn/
http://nandgame.com was posted on HN recently and I found it to be fun and educational: https://news.ycombinator.com/item?id=17508151