There were once the days of the sea creatures, the dinosaurs, the wooly mammoth, and the Homo sapien himself. Now enter, the days of the Monsters! While mass extinctions usually occur by nature itself, this one has begun due to one mad scientist who was picked on a little bit too much when he went to school. Now with him, you can control all of the different monsters, adding on upgrades as you go. So, how efficiently can you destroy all of the worlds major cities? Just remember, don't try this at home, or in your sandbox for that matter.