you get missions and the invisibility cloak
The Gryffindor common room.
Ginny is in the Gryffindor common room.
Ravenclaw's common room is in a tower like Gryffindor's is.. In the ootp game there is only Gryffindor's room
With Godric Gryffindor's sword...
No, you cannot see any other common rooms in this game other than the Gryffindor room.
No, James Potter was in Gryffindor house. Harry's mother was also in Gryffindor.
Harry Potter did not get out of Gryffindor, he was sorted into this house and was part of it until he left school. To enter and exit the Gryffindor common room, he went through the portrait of the Fat Lady. To enter he had to give her the correct password.
The Gryffindor champion is in the Gryffindor common room by the notice board. The Ravenclaw champion is in the library at the table. The Slytherin champion is is the Great Hall near the table where Dumbledore's chair is.
In Harry Potter and the Philosopher's Stone, Harry was sorted into Gryffindor house in chapter seven, "The Sorting Hat".
Harry Potter plays on the Gryffindor Quidditch team.
Harry Potter played for Gryffindor house.
There are three. The easiest one is in the Gryffindor common room. Another one is at the Slytherin table in the Great Hall. The hardest one is in the library.