Half-Blood Prince features the exploration of Hogwarts and casting spells on objects around the school, similar to its predecessor Order of the Phoenix. The game also includes multiplayer games, classes, different times of day, Quidditch, Wizard Duels and Potion making. The Marauder's Map is included in the game, as further progressing can open parts of the school. Harry can also call Nearly Headless Nick to show him around the school. As Dumbledore mentions, the Duelling Club begins. Harry is allowed to duel freely with students and learn spells from them. The Gryffindor Duelling Club is located in the Great Hall, while the other houses are in other places such as the Paved Courtyard, Training Ground, and Transfiguration Courtyard. As Harry attends Potions class, mixing ingredients to make potions is done with the Wii Remote or analogue stick. Harry must also join the Potions Club, which is in the Herbology classroom. Potions ingredients surround the cauldron on the work bench, and through visual symbols which pop up onto the screen you must follow the instructions to complete the potion. Harry is also named Quidditch Captain. Other members on the team are Ginny Weasley, Ron Weasley, and Katie Bell. They all participate in try-outs and in the Quidditch Cup against Slytherin, Hufflepuff, and Ravenclaw. When Harry has detention, Ginny is the seeker, while Dean takes her spot. When Ron is in the hospital, Cormac McLaggen takes his spot on the team. During the game there are 150 shields to collect which may be found throughout Hogwarts castle. The shields can be found by casting spells such as Reparo if they are broken on the ground or by using Wingardium Leviosa to throw an object at one if it is on a wall or an unreachable place. Shields can also be gained by collecting mini-shields which are located in lamps and bannisters. There are also 10 shields given when a specific miniquest is completed by the player. The school grounds are nearly identical to the previous installment. Some new areas are added, including the entrance to Hogwarts. Other areas previously accessible are now inaccessible due to the new security of Hogwarts added by the aurors.