I don't believe you collect any. You just turn them on or off.
In the wave options when customizing a firefight game.
after Halo reach,there is no more In total, there is :Halo 1,Halo 2, Halo 3, Halo ODST, Halo wars and Halo reach
No, Halo Reach shows what happened before Halo 1. In fact, in one of the missions in halo reach, you can see Master chief
halo,halo 2,halo 3,halo3 ODST,halo wars,halo reach
There are no skulls in Halo Reach.
you have to restart the game and activate skulls from the main menu
No. You are given them all.
You click on the tab that says skulls and you click on the skull.
I'm not sure how to use them, but when you activate a skull, I think it unlocks extras in the game.
No, only Oddball.
practice practice practice :)
When in the campaign lobby, press X to bring up the settings menu.
You can, just like in Halo 3. It will have more skulls in it too. I'm not 100% sure what all of the names are and their functions, But I will test it VERY soon.
The skulls are used to activate cheat codes, such as recovering health when you punch an enemy. You activate these by pressing X at the mission selection menu.
I don't believe you collect any. You just turn them on or off.
In the wave options when customizing a firefight game.