During this period, the push for marketing by both Nintendo and Sega led to the growth of video game magazines. Nintendo had already established Nintendo Power in 1988 in part to serve as a help guide for players on its popular titles, and was able to use this further to advertise the SNES and upcoming games. Numerous other titles grew in the late 1980s and early 1990s, giving Sega the opportunity to market its games heavily in these publications.[28]