"What is Hybrid?" That's the tag line Scibblenauts dev 5th Cell has been using for its upcoming multiplayer shooter for Xbox Live Arcade. Unfortunately, in spite of some new videos, we don't really have a great answer to that question.

Thankfully, that should change once the beta for Hybrid goes live at the end of April.

Sign-ups for the closed beta are live right now on the game's official website. Keys will be distributed "in a few weeks" to those that register, and will continue "throughout the course of the beta."

So, what are you signing up for? Well, here's a video that explains to answer that question--what is Hybrid?