This one is built to occupy a busy mind. The layout reads like a small maze, with routes that fold back on themselves and an escape hatch that adds a surprise exit, so a bored cat has something to work out rather than just a place to sit. The bright, active cats tend to love it most.It comfortably suits a home of one to three cats, with enough branching to keep them from bottlenecking each other. Add the optional scratching pole if you want a claw-friendly surface worked into the climb. Versions are made for both 16 and 24 inch stud spacing.