The Odyssey 300 dedicated console was released in 1976. Unlike Magnavox's previous two dedicated console products, the Odyssey 300 was meant to compete directly with the Coleco Telstar. Like the Telstar, the Odyssey 300 uses the AY-3-8500 chip as its logic and was among the first dedicated consoles to use a single IC chip as the focus of its design rather than multiple computer chips or transistor–transistor logic. The 300 has the same three games as the Odyssey 200; unlike the 200, the Odyssey 300 console has three difficulty levels: Novice, Intermediate and Expert. It also introduced on-screen number scoring.
Source: Wikipedia, "[en.wikipedia.org/wiki/Magnavox_Odyssey_series%23Odyssey_300 Magnavox Odyssey series]", available under the CC-BY-SA License.