All guards will fall asleep upon being shot with the M9. All guards will be knocked out when you roll or throw them.

Hind-D, Wolf 1, Wolf 2, MG-REX take the least damage to kill

Pick up the M9 near where you spawn at the Docks

There are stun grenades in the lockers at the Docks.

No guard appears on the elevator at the Docks.

You don't need a ration until Disc 2 if you play well.

You can run into the spotlight, or use a stun grenade to start an alert at the Helipad.

You do not need the chaff for Nuke Bldg 1F door skip, so hold up and then tap upright after 3 steps forward at the Canyon.

You can equip the M9 in Nuke Bldg 1F, so use that for door skip. Each guard needs one shot to fall asleep.

When alerting Meryl to your presence in Nuke Bldg B1, fire the SOCOM in the hallway before entering the office area. Then hold downleft to get into Meryl's sight.

You do not need Pentaz to steady your aim, and you can get by with only picking up the ammo loaded in the PSG1-T.

For Wolf1, you need a combination of 3 headshots and 1 body shot. This is unique to Very Easy

M9 in the Canyon revisit is very good

Go to the left from your starting position to fight Raven

Refer to Normal for everything else