Cute concept. I liked the CTF game from Stripe[1], it progressed more quickly and there were no ads. It felt like a more genuine challenge.<p>Some interesting Google results show for hackerskills.com [2].<p>[1] Stripe CTF 2.0: <a href="https://stripe.com/blog/capture-the-flag-20" rel="nofollow">https://stripe.com/blog/capture-the-flag-20</a><p>[2] Skip ahead?: <a href="https://www.google.com/search?q=site%3Awww.hackerskills.com" rel="nofollow">https://www.google.com/search?q=site%3Awww.hackerskills.com</a>