What I Think About When I Think About Act 3

When I think about act 3, the first thing I remember is Polonius died. Hamlet thought Claudius was spying on him and Gertrude and stabbed him, but the spy was really Polonius. Another thing I remember is Claudius reacted just the way that Hamlet predicted he would during the play. Hamlet was then sure Cladius murdered his father. Claudius feels guilty and prays to God asking for forgiveness but I believe this is all an act.