Scratching posts/pads are important to cats for scent marking and stretching, as well as for grooming their claws.
The scratching pad must be placed at a height where cats can stand on their hind legs and get a complete stretch in their back when scratching. In smaller enclosures, a smaller (usually cardboard) scratcher can be attached to the cage door.
Purchase inexpensive cardboard scratching pads and tie them to the front of the cage using twist ties. You can also tie carpet remnants to the front of the cage using plastic zip ties.
Fill a shallow container with water and a few floating toys (ping pong balls work well). This can only be done in a playroom or communal room where there is a sufficient amount of space
Tissue Paper (or Newspaper)
Hide and Seek Paper Bag