I started working on this project a while ago. It all began with a discussion between me and a coworker. From time to time I announce D at work. I also tried to push some of my coworkers to try it, but haven't had much success, perhaps I'm just a terrible salesman. One of them seems to understand the appeal of the language, however, doesn't have a reason to start messing with it. So, in one of my recent discussions with him I asked "If D had a similar project to Rustlings  would you give it a try?", and the answer was yes because although he is curious about the language, he thinks he needs a reason to start messing around with it. Randomly messing around is not his thing, and using it in a project could feel counter-productive because of the time spent learning the language instead of actively working on it. A project similar to Rustlings would, on the other hand, be quick enough to get going. Just start solving simple exercises to get a feel of the language and what the features are. He could stop at any time and come back whenever he feels like to keep progressing without feeling forced to do it.
So, I started working on Dlings . My approach was to have it as close as possible to Rustlings. They created a working recipe, why not just follow it? So, right now, this is a clone of Rustlings. There are a bunch of things that need to be polished, but I felt it was good enough to release it and start adding exercises.
This is where I would like the community to come in. There are a lot of experienced people in the D community, more knowledgeable than I, more creative, and with experience in education. I would like, if anyone is interested, to ask you to give your opinions of how the exercises should be structured, the topics to teach, how could they look, etc. Contributors in general would be great! There is another project - dingbats  - from monkeyyy, that has some topics and ideas laid out if you want to check it out.