Red Dead Redemption Undead Nightmare is rated "M" for mature because of is genuinely bloody gun fights and sexual themes. It also has alcohol and drug references.
Due to violence language and other M stuff
No there isn't any sexual themes in this game. I own undead nightmare myself and there is no nudity , gambling or scary parts. There is violence obviously because its the aim of the game ; stay alive for aslong as possible and complete it! It is rated 18 in the UK but 15 in Australia. Personally it should of been rated 15 in the UK. Alot of kids have this game and they enjoy it alot!
A Nightmare on Elm Street 2010 is rated R Wes Cravens New Nightmare is rated R
The Quick and the Undead - 2006 is rated/received certificates of: Australia:MA
It is rated "R".
Undead Noise - 2012 is rated/received certificates of: USA:PG-13
The Nightmare Before Christmas is rated PG.
Virus Undead - 2008 is rated/received certificates of: Netherlands:16 USA:R
Her Redemption - 1924 is rated/received certificates of: UK:A
Redemption - 2004 I is rated/received certificates of: USA:R
The Game is rated M for Mature Probably Rated Mature for: Violence, Blood, Language, and Sexual themes that would be my guess when i saw the trailers
PG
Zombie Undead - 2010 is rated/received certificates of: Australia:MA15+ (2013) UK:15