Thank you to everyone who replied to the following tweet! It's an excellent list of sites people like to use.

I did a quick look over all of these sites and am providing my immediate impressions from them. It's very possible they might be missing something. :) If a correction needs to be made, or if there's another really awesome thing about any of these sites that I missed, just drop a comment and I can update this post.

1. codewars

• 20+ languages available
• Others' solutions are available for review
• You can practice writing your own tests

2. HackerRank

• 20+ languages available
• Many skills categories and challenges to explore
• Job board seems like an added benefit :)

3. exercism

• 50+ languages available
• "Mentored mode"—the linked page has a ton of information about the structure of this
• There's a lot of steps for each challenge, with downloading the code and then having to resubmit it. I have a preference for interactive challenge sites.

4. CodinGame

• Several languages available (I didn't count, they were in a select)
• Multiple types of challenges of varying skill levels
• A bit overwhelming to me, there's a lot happening on each screen

5. ProjectEuler

• Not an interactive coding website, BUT
• A lot of great challenges for writing software solutions to

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