My secrets im listing now dont have skulls or terminals in it !!

1.secret pack of cavemen
On lvl serra 117 to the bit just after that pelican got shot down and after you kill the brutes there should be a bit with lots of sniping jackals keep walking on your far left until there is a rock and on top of that rock is a jackal kill it a d there sould be a sticky out bit like this ;
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Walk along that ledge ( the rubbish arrow is pointing to what i mean )thein once you have walked across it look to your far left corrner and there they are.

2.Brute doing up his zip
On the lvl the ark go all the way to the bit where the sleeping grunts are every were
go to the top right of the room and there is a brute witch must have been peeing up the wall doing up his zip ps:make sure not to wake up the grunts

3.The coverment
there are two secrets on this lvl so i will start with the first one

1)The anti air wraith
At the start of the lvl kill all the enemys and when you get to the anti air wraith (the goldish one)leave the grunts around it alive but kill the brutes and jump onto the wraith and crouch on the bit were he would get in shaped like this.
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: x :
: v :
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The x means that is the best place to stand and the v is witch way you should face.Look down wile your crouching make sure it dosn't say hold RB to do some thing to the thingy(I forgot what it says but if it says anything move about a bit when your crouching until it dosnt say anything on the screen).Thein meele (press B to whack/meele) the bit until it breaks open and you can see a brute driving still making sure you cant see any words on the screen Hold RB and start shooting the brute in the head until dead using a battle rifle or covernant carbine and since your still holding RB you sould get in (if you let go of RB or dont crouch and shoot him in the head but dont hold RB it wont work and if you do do it right you should get in but when you get out it expodes).
2)After you fight the first flood in the lvl when you get out of the building the arbeter should get in a phantom jump in it with him and your in it and it sould fly off thein turn invisible when it tuns invisible you sould fall through it and die.

4.lvl Halo i will write this one soon look for it but its got so many secrets and with my luck my computer would crash when ive write it all!!!!!!!!!!!