I enjoyed Natas[0] some years back, which is a simple and relaxed web security (only) challenge. They have other games too, no login required. 0: https://overt

I enjoyed Natas[0] some years back, which is a simple and relaxed web security (only) challenge. They have other games too, no login required. 0: https://overthewire.org/wargames/natas/ https://overthewire.org/wargames/natas/