There is a premium currency used in the game that is rarely given out so users who want to advance quickly or do well in multiplayer will be forced to pay real money in order to upgrade to a competitive level.
Deer Hunter 2014, like many other free to play games is pretty easy. This way casual players will stick around to spend bucks on the artificial roadblocks set in place by the developers as to encourage users to spend their money to continue playing a game with little challenge.
Core gameplay mechanics are of old-school first person shooter. Players move room to room finding objects called nodes to shoot before being allowed to leave to the next room. While trying to find the node players will of course be facing off against AI controlled enemies.