The Cry of fear grading system is a system of which players score a number of points by filling out required criterias. The grades that the player recieves is determined by 5 different aspects. The grading system is explained in the second page the Secret Book (Shown right)
Simon's Book is unlocked upon getting an S Grade (35 points)
After the 1.3 Patch of Cry of Fear, all saves that were saved during 1.3 or before were damaged and caused the end stats to become broken. This included people taking negative total damage, unusually high playtimes and excessive shots fired. This was fixed in the 1.35 patch.
During Version 1.1, there was a glitch that allowed players to get an S Grade even if they take over 2.5 hours to complete the game. This has been fixed.