Harry Potter and the Half-Blood Prince is a sandbox game. Don't get over-excited, we're not talking Saboteur or GTA here, we're talking one of those little shell shaped plastic sandboxes that you get from Argos – small but serviceable. The problem is that somebody forgot to give you any toys, so you're left playing with a stick (Quidditch), some ants (Duelling) and most exciting of all – sand and water (potion mixing)…oh and the ability to stomp around your little box to your heart's content.