On Lego Indiana Jones, how do you get in the other holes. In the artifact room, Young Indy and how others?

for young Indy, collect all the artifact pieces in Raiders of the lost ark. for ancient city, collect all the artifact pieces in temple of doom, and for warehouse, collect all the artifact pieces in the last crusade. (artifact pieces are the chests) Then go to Indy's office and gather the boxes, place them in the center piece, build them into a box, break the box, pick up the key, and go to the artifact room, place the key in mechanism, turn key and it opens holes in ground. if you already collected the pieces, the stages should be open. (for Indy's office you will need the explosion, academic, gl-shatter, tiny-size, digging, high jump, and thuggee abilities)