Gameplay has been improved for Pro Evolution Soccer 2009, with key additions as an improved Teamvision system, tactics change according to situation, better off-the-ball movement such as running to receive passes and the AI recognizing strategies that works accumulating data on an ongoing basis within Master League and League modes. Another new addition is the readjustments for ball movements. PES 2009 has new air resistance calculations for the trajectory of the ball. The heaviness of the ground also impacts the gameplay.