This post was written 5 mins after the first one.

I shall talk abt Halo 3, for no particular reason.
Currently have 27 achievements unlocked.
Current skulls : Blind, Famine, Mythic, Grunt Birthday Party (REALLY!), Iron
Currently playing Heroic campaign; stuck on "The Covenant".

Something about GBP skull (look above), when you headshot a grunt, a shower of coloured paper(?) scatters around the Grunt, dealing minor damage. Basically, this causes INSTANT death to any orange or red hat grunt, whereas damaging Jackals and grey grunts. It seems to have no effect on brutes or whatsoever.

And Gravity Hammer > Hunter. 2hit KO. 1 hit from back.

Some secrets : Theres a 'no skateboarding' sign somewhere on Crows Nest (forgot where exactly). Theres also a sign of a man walking up a staircase near the barracks.
For more fun in the Barracks; place a grav lift when you enter the barracks. (Where the brute throws the marine after 10 secs) The marine will NOT die if he doesnt crash into the wall.

You can kill Johnson in "Halo" to get a one shot Spartan laser. From now on, he will take the nearest weapon on the floor when he revives (I made him take a Energy Sword)

It IS possible to jump down from the floor above in the ark (where you activate the cartographer) to the one below for evac. All you need is to aim, throw a grav lift below, and jump into the area. With luck, you shld have around 35% of ur hp deducted, but no death.

There is a small part of the sky on one campaign mission that looks like a human face.

On Crow's Nest mission part 2 (Gift with Purchase), where you need to evac the marines in the barracks, you can jump on top of the pelican that is evacuating the marines. However after a while you will die.

On mission The Covenant, near the end part where you had to breach the Citadel, at the first bend before the Hornet, (there are 3 bends) jumping down or driving a vehicle down is instant death. After you board a Hornet, disembark and try again. Now you would not die.

This is not really a secret, but on the mission Floodgate, on board the Flood Ship where you have to retrieve Cortana, there are small (not exactly) lumps that hold many small flood thingies. Smash it with your Gravity Hammer for some juicy action. No points awarded though.

Theres one small spot in the middle of the map at the starting part of mission "Halo" that causes instant death when you walk into it. (A small hole; avoidable)

On Mission 3, Tsavo Highway, I got a banshee within 6 mins. I ended the mission in 16 mins. At the place where you see the 3 or 4 choppers and first barrier, look at the sky. Occasionally, Banshees will fly over you. I was super lucky, and got one down with 2 beam rifle shots. Then, just fly OVER the tunnel, and mission complete.
I should be able to complete within 10 mins, but since i had to get the 15k points for achievement, i decided to fly around and do some hunting. (The sky near the choppers is a good place; there are at least 15 banshees up there, each granting around 175 points.)

Btw, not really a secret, but Master Chief blows up an AA wraith in 3 melee whacks, when you need around 6 rockets to blow it up.

yourMOTHERdied @ 4:38 AM!!