This game is related to Food Chain. It has 2 levels:

 In 1st level you need to select the animals  in such a way that they need to form a perfect food chain. The more the length of the food chain, the more score you get.

  In the 2nd level , you can freely roam in a forest and can search animals hidden in mystery boxes, pick them in the order which forms food chain in order to score more points.

This game ensures the users to know the importance of every single animal of food chain  in an ecosystem such that even if you lose some animals in bottom levels(primary and secondary), then slowly  the higher level (tertiary) species will become endangered. 

More information