A new mouse house

So..since we are soon going to have 14 mice running around...we decided to expand the mouse house. The portion on the left is the original house...the house on the right is all new. My kids think it is the coolest thing EVER. LOL Of course...the mice haven't been to the new side yet....*sigh* the one set of coneecting tubes has large ridges inside that makes a "ladder" and the new set of tubes has very tiny ridges...so they are scared to go down the side with the smaller ridges. SO..I guess I will go today and buy some more of the big ridge tubes. good grief.