NATURAL CAVE REPLICA Simulates natural caves with varying depth depressions, providing cats with a digging and scratching experience to satisfy their instincts and train paw coordination Robust design: soft felt with paw-friendly texture and moderate friction guarantees safe cat toys for hours of interactive fun while maintaining durability and comfort Natural curiosity satisfaction: 3D puzzle game with layered system inspires problem-solving play through interactive hiding places and supports cognitive development through customizable difficulty levels Hidden Bell Ball: built-in rattle ball stimulates cats' natural exploration instinct, provides engaging solo play with unpredictable motion sequences for long lasting entertainment Sound stimulation game: combines maze exploration with sonorous stimulation for exciting digging challenges. Burns cat energy playfully and stimulating through interactive fun.