Nintendo, Sega, and Atari are all major video game companies that have been around for decades. Nintendo is an 8-letter company that was founded in 1889 and is known for its iconic characters such as Mario and Donkey Kong. Sega is a 4-letter company that was founded in 1960 and is known for its popular console systems such as the Dreamcast and Genesis. Atari is a 5-letter company that was founded in 1972 and is known for its classic arcade games such as Pong and Asteroids. All three of these companies are considered to be giants in the video game industry.