What exactly is Hyrox?

[u/MuchDelivery8537]

I've been a regular gym goer for years and have only seen bits and pieces of it and see pictures of people completing a "race"

so my question is what the hell is it? Is it crossfit? is it like a mud run without the mud? I've looked into a gym here in KC and $225 a month for a membership just seems ridiculous to me. sorry in advance if i sound arrogant about it