Suggestions for free CTF/Cyber Competition games?

Hello!

I work with my college's cybersecurity program and I am organizing a career networking event that will include a cybersecurity contest for the students. We are looking for a game that can be team-oriented or done individually, and not take more than 1 to 1.5 hours to complete. Does anyone have suggestions for capture the flag or any other styles of cyber games? Thank you!

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