 Backbreaker relies on the Euphoria engine , a real time animation engine developed by NaturalMotion that has been used in games such as Grand Theft Auto IV , Star Wars : The Force Unleashed , and Red Dead Redemption . This allows animations for tackles and blocking to be created on the spot instead of using a limited set of canned animations . Due to this , developers pushed to advertise that " no two tackles are the same " in an attempt to draw players to what they called a more physically realistic football game than its competitors . The physics system was rated well by the reviewers , who commented that the integration of realistic physics created a very lifelike interaction between the players on the field . 
