→ Try Hack Me https://tryhackme.com
→ Attack-Defense https://attackdefense.com
→ alert to win https://alf.nu/alert1
→ CTF Komodo Security https://ctf.komodosec.com
→ CMD Challenge https://cmdchallenge.com
→ Explotation Education https://exploit.education
→ Google CTF https://capturetheflag.withgoogle.com
→ HackTheBox https://www.hackthebox.eu
→ Hackthis https://www.hackthis.co.uk
→ Hacksplaining https://www.hacksplaining.com/exercises
→ Hacker101 https://ctf.hacker101.com
→ Hacker Security https://capturetheflag.com.br
→ Hacking-Lab https://www.hacking-lab.com/index.html
→ HSTRIKE https://hstrike.com