Luna programme became the first probe to achieve a soft landing on another planetary body. It returned five black and white stereoscopic circular panoramas, which were the first close-up shots of the Lunar surface. "Luna 10" (March 1966) became the first artificial satellite of the Moon. "Luna 17" (November 1970) and "Luna 21" (January 1973) carried the Lunokhod vehicles, which roamed around on the Moon's terrain. Another major achievement of the Luna programme, with "Luna 16" (September 1970), "Luna 20" (February 1972) and "Luna 24" (August 1976), was the ability to collect samples of lunar soil and return them to Earth. The
Mega Man 2 series were defined by the first game, but "Mega Man 2" added crucial conventions that were retained for the rest of the series. The traditional number of Robot Masters for the series is eight as used in "Mega Man 2", rather than the six used in the original. It was the first in the series to include an opening cinematic. "Mega Man 2" also introduced the Energy Tank item, special movement items, teleporter room, and password system, which became staples in future games. The Energy Tank became the series' iconic health refill item and later served as inspiration for a