These are some tips to the people who want to beat the hard mode with the S rank.

First, for the newcomer of the RE game, go ahead and try out and pratice some more with the easy mode. (can choose to play with either gun or Dual Shock2)

If you are a RE veteran "like me", then you don't have to waste time in the easy mode; go ahead to get the normal mode. I beleive that is a piece of cake for you to beat it. The main point of this first try out is for you to go through the game one. Therefore, the second time in hard mode will be easy for you with those puzzle solving.
(can choose to play with either gun or Dual Shock2)

The first advice for the hard mode is play with "Dual Shock2" through the game, because it is a way to save ammo. Using "Dual Shock2" can help "boom" zombies' head easily with one hand gun shot. If you success with that trick, it is not that hard for you to get to the end of the game under the limit of ammo in hard mode. Finally, before encount with the last boss, change back to "gun" control, because it is easier to beat the last boos.

~~~ enjoy your inf. electric gun
~~~