The new Pro Version of the famous Sniffy software simulates a wide range of learning phenomena that are typically discussed in courses on the Psychology of Learning. Sniffy, a realistic digital rat in an operant chamber (Skinner Box), gives students hands-on experience setting up and conducting experiments that demonstrate most of the major phenomena of operant and classical conditioning. Users begin by training Sniffy to press a bar to obtain food and progress to studies of complex learning phenomena. In addition, a series of "Mind Windows" enable students to visualize how Sniffy's experiences in the Skinner Box produce the psychological changes that their textbooks discuss in connection with the phenomena simulated. The Sniffy, Pro Version CD-ROM comes packaged in the front of a brief Lab Manual that walk users through the steps that they need to follow to set up a wide variety of operant and classical conditioning experiments that closely resemble experiments discussed in learning texts.