ok then:
gnome in garden next to mailbox - r2, l1, r1, l2, left, O.
using the gnome:
fill all motives (like sleep, hunger e.t.c.) - l2, r1, left, O, up.
get cash from gnome - l1, r2, right, square, l3.
unlock all locations to visit - r2, r3, l3, l2, r1, l1.
unlock all objects - l2, r2, up, triangle, l3.
unlock all social options - l1, r1, down, X, l3, r3.
all of these must be done during gameplay very fast. if you have done the cheats right you will hear a sound.