This trophy requires you to score 2 goals on the opposing player with the Double Score powerup. In other words, you must score 4 points in one game using the DS powerup, as each goal is worth 2 points. Your best shot is to set the goal quota to 20 and check as many players as you can to get those player-boosting power-ups onto the ice. Checking can be executed with the circle button or by flicking the right thumbstick (I prefer the thumbstick). Remember that the NPCs on your team like to check the enemy goalie from time to time, so wait for that if you have trouble making shots. Slapshots can be executed by bringing back the right thumbstick and sharply pushing it in the direction you wish to shoot. Difficulty and game speed do not affect this trophy.