Battle Camp is an addictive, combo game with some attributes of your typical card collection game. 

You must match at least one combination of three of the same element: Wind, Rock, Leaf, Fire or Water.

A combo of 5 upwards will do damage against all monsters

You will start collecting monsters, which can be fused to create more powerful monsters. >>>> More on fusing here 

You will also unlock puzzle pieces to create Rare, Super, Ultra and Epic monsters. These can be found within battles or by completing raids with your troop.

 >>>More on troops here