THIS IS NOT A TUTORIAL. This is a brief demonstration of a wall jump from crysis. This can be accomplished by practice and skills. Many noobs as asked me if this is a type of MOD or Hack. THIS IS IN NO WAY A TYPE OF HACK OR MOD. This is a glitch found in the game and can be easily done if mastered. This glitch can be done on single player AND multiplayer. According to many servers, you can use this glitch without any consequences, in fact, this may be a life saver during tight situations! (One server has an "anti-wall jump" programming, make sure you don't choose it) 
Player: MasterRambo Skype (Account name): iam_master_rambo