Hints

Keys In the Attic:
In the attic it is NOT a trap door, but loose BOARDS! There is loose floorboards that contain 2 keys....ie:1st. Floor OFFICE and Small guilded key. Use the crowbar in between the small doorway between rooms and it gives you 2 keys.

I Already Know:
In the main room of the manor, there is a statue that requires you enter two letters, you can either push the statue to the right and see the letters H and M or just ignore what i said and enter them anyways...

GameShark Codes

HP         
801450D8 0064

Pistol Ammo
801452C8 000C

Shotgun Ammo 
801452D0 0009

Grenade Launcher Ammo
80145300 0005

Rocket Launcher
801452E8 0004

Infinite Ammo - 3 Barrel Gun
801452D0 0009

Infinite Ammo - Photoeletric Pulsar
801452D8 000A

Infinite Ammo - Plasma Cannon
801452F8 0064

Have light gun
80145268 006b

Thanks to Revolution readers JIT, Kevin, and Deborah Dillard!