The series is credited for pioneering and popularizing stealth video games and "cinematic video games". Notable traits of the series include stealth mechanics, cinematic cutscenes, intricate storylines, offbeat and fourth wall humour, and exploration of cyberpunk, dystopian, political and philosophical themes, with references to Hollywood films to add flavor. The franchise has also been adapted into other media, such as comics, novels, and drama CDs. Solid Snake has also gone on to appear in other games, such as the "Super Smash Bros." series and "Ape Escape 3".