There's also a fun dog tag collecting sub game where you can hold up/threaten enemies into dropping their tags that then unlock items if you collect enough

The landscapes can look a little muddy and thus sometimes enemies can get lost in the much and be difficult to find.

Enemy A.I. is rather poor too, except when you go up against the enemy vehicles, which replace the boss fights from previous MGS games, and that was another poorly thought out concept

After knocking out an enemy, Big Boss can attach a small parachute/balloon to the enemy's hip and then they go shooting up into the air to be collected by a passing helicopter (a.k.a.: Fulton Recovery)

enjoy yall!!