private void updateGame(Scene scene){
            // Update the input devices:
            for (InputDevice device : inputDevices.values())
                device.update();
            // Check scheduled Callbacks:
            scene.checkCallbacks();
            // Update the game:
            if (!isFrozen()){
                // Collision-events:
                for (CollisionEvent event : scene.collisionEvents)
                    event.detectCollision(scene.game_field.getCollisionTest());
                // Movement-events:
                for (MovementEvent event : scene.movementEvents)
                    event.move(scene.getSceneTime());
            }
        }