#1. Crouching and proning are the keys to surviving. At any time if you are under heavy fire you can go prone to reduce the chances you will take further damage, whether you’re behind cover or not. You could also get more advanced and reload while prone.
#2. That’s another thing, you need to just find cover when under fire as your health will refill with rest. Never assume your cover is safe, so crouching and going prone helps.
#3. Aiming without using the sights is sometimes the best for hitting an enemy quickly, but you’re less likely to get the headshot.
#4. Pressing the aim button when enemies are in front of you will auto-aim to that enemy, but only briefly, and it’s not like you get an automatic headshot or anything. It just helps aim quicker, or even to know if an enemy is in the place you’re looking.
#5. You can “cook” grenades by holding the grenade button, then letting go. This reduces the time the enemy has to toss it back, just don’t hold it too long yourself.
#6. On the flip side, anyone can toss a live grenade back or anywhere. When you see the grenade indicator you can run away, or quickly go to the source and try to toss the frag back.
#7. Finally, if you see the grenade indicator, just press the run button and go far away from the area you’re in. It’s always best to see frag coming in, then you just run away or try for the quick toss back.
#8. The melee button is a must, especially for the Japanese portion of the game. Just press it with an enemy near and they die, simple as that. Also be ready to press it when you are caught by a banzai, but you have to wait until you time to press it or you’ll miss the timing.
#9. If you are ever lost, follow your friends. On the same note, when in battle, if you see a name over a person when you are aiming at them, that is an ally, so don’t shoot.
#10. Some battles are against a set number of foes, but most of the big ones are against an almost infinite stream of enemies. Advancing on their position is the only way to stop this flow. I believe they do end at some point, but if you see enemy positions being filled as soon as you kill those enemies, it’s probably best to start moving up.
#11. Ammo and guns are all over the place, something is never far from you. You can carry any two guns, so feel free to always carry the best you find. Also, keep your eye out for side areas or guns leaning against the wall, those are usually good guns worth finding.
