5 to 6. its right for me. i went into custom game an played against bots changing it every so often an pumping up the difficulty to i believe its hardened? i cant remember the one below veteran. Around that area is the best for me to still be able to turn if i hear or see on the map if someone is behind me. I can still turn on kids to but its my fault for not seeing them an they come from a corner behind me.