PC. And, the creator of Zoo Tycoon, Blue Fang, actually ENCOURAGES people to make their own animals and such. You may distribute it online, as long as there is NO monetary gain whatsoever. And although the PBR sprites would work for a base, you'd need to make many more animated sprites for them, plus fences especially for the fire types and such (Fire proof fence for Magcargo) and possibly new Biomes, which nobody has done yet due to difficulty. But if someone pulls through with this, I agree, BEST HACK EVER!