Metal Gear Solid: Peace Walker

- Do not bother trying to S-rank or no-kill missions your first time around. Even then, there is nothing to be unlocked from S-ranking the Main Ops, and only from some of the Extra Ops.

- ESPECIALLY do not stress out trying to S-rank boss fights first time round. Just kill the guys and shoot at the vehicle gas tanks.

- To capture an enemy vehicle, you must eliminate all of its escorts, and then kill or sedate the vehicle's pilot when they stick their head out. If you get spotted, however, you need to damage the vehicle a little until they pop out, but they ONLY pop out when there are no more escorts left. Aim for the red fuel tanks for extra damage.

- How research points (I forget the proper name) work, because it's not intuitive: You have a set amount of points, the number of which changes depending on your recruits. When you set something to research, some of those points are used up, but they are returned to the pool when the research is complete. So it's not like cash.

- You unlock Extra Ops as you complete the Main Ops, at a rate of about 1 of each at a time. Finish them all, they unlock new research topics for weapons which come in VERY handy in the Main Ops.