Green Glass Doors

Puppies can go through the Green Glass Doors, but trains can't.

Green can go through the Green Glass Doors, but red can't.

Happy can go through the Green Glass Doors, but sad can't.

Trees can go through the Green Glass Doors, but leaves can't.

Apples can go through the Green Glass Doors, but shoes can't.

The following can go through the Green Glass Doors:

*Sunny
*Yellow
*Muffin
*Harry Potter
*Brunettes

The following CAN NOT go through the Green Glass Doors:

*Boys
*Pants
*Canoe
*Ron Weasley
*Gingers

Figured it out yet? It's a Never Tell game so I can Never Tell you the secret.