Primeval - Free Version

Primeval is a tile based strategy game which pits you against a local player or AI opponent (up to 4) to place your hand of primordial beasts in an evolutionary struggle to dominate the landscape with the most offspring possible.
Simulate your chosen ecosystems to see who comes out on top by deciding where and when to place your giant predators to decimate your opponents populations and when a space is right for a tiny burrowing herbivore to win the victory points and win the game.
Almost 1000 species are available in the full version from fearsome T-Rex to Smilodon and Brachiosaurus to the mighty Steppe Mammoth.
This free version includes some ads and only has Permian, Triassic, Jurassic and Cretaceous periods to battle in. The full version also has the age of mammals (Paleogene, Neogene and Quaternary) to play with.
Full instructions on the rules are included in the app under the blue "?" button in the menu.
Rules:
Place a ecosystem tile.
Choose to randomly switch another tile.
Place some species on the board.
Enter the feeding phase as you struggle to devour the food points on the board or attack your opponents species before they do.
Score based on how many survived into the next round.
Evolve your species all the way from the Permian (300 million years ago) into the present day with the full version or the Cretaceous KT extinction event with the free version.