Open it with CheatEngine, select the ps_game process, after the count of kill, and u change the count kill, 2 instead of 1, is possible change amount into it " add eax,01" change the 01 amount kill that you want, remember it is in HEX so, 01 is 1, 02 is 2, 0a is 10 etc, but if want use the int kill, so write only 1 2 3 etc, change:
newmem:
add eax,01
mov [esi],eax
jmp exit
originalcode:
add eax,01
mov [esi],eax
to:
newmem:
add eax,(int)1
mov [esi],eax
jmp exit
originalcode:
add eax,(int)1
mov [esi],eax
i think that so, work it