With some help from JASON Host Researcher Russell Cuhel, size up one of three ecosystems before designing an invasive species to infiltrate and disrupt, eliminating rival species and witnessing the rippling repercussions your invader has on the ecosystem as a whole.

Pick a defense mechanism to fortify your invader against the natives, color it to better blend with the environment you choose, select which trophic level it will inhabit (don't worry, you'll learn what this means!), and release it into the wild!