I've relised that (obviosly), Halo 3 is ALOT more played then Halo2, so i found some eggs for all the hungry players!
There is a trash-talking grunt on the last level.
As you're driving the wathog, and u get near the end of the level, just before u jump onto the ship, there is a pillar on your right. Drive over to it. Get out, and walk over to the grunt.
He has a mouthful to say. Please enjoy
1. Go to custom games, and start a match of Assault. It does not matter what level, just any assault game type.
2. once you're in game, pick up the bomb and then end the game.
3. Go to the theater and watch your character just after he picks up the bomb. Right when you see yourself pick it up, you should be able to see the back of the ball.
4. If you look at the top of the ball, there it is, in white writing "HOLD ONTO YER BUTT"
This egg is on the level "The Covenant." At the beginning of the level, when you destroy the AA wraith and get the new warthog, drive to the place where the wraith, ghosts and prowlers are. Where the shade turret is, grenade jump onto the ledge nearby. Then go up until the invisible barrier blocks your way. Jump off and you should be levatating. "Levatate" to the cliff next to you and walk up it. Then go off the edge of the cliff and the sky will turn orange, and you will be at the part where you have to fight the two scarabs, although there will be no scarabs, banshees or hornets. You sould be JUST outside of the map. Continue on until a mysterious structure appears. It will look normal at first, but look at the back of it! It is covered in blue letters on a grid-like multi-colored backround.
In the level "The Storm", you must watch a saved film and go until the point where you fight the Scarab, and go into the large wrecked boat. In the bridge of the ship, there is a poster displaying a man wearing a big pirate hat, with the words "Sheik of the Ship" below it.
This is a reference to "Pimps at Sea", a long time joke by bungie, commonly an april fools joke.
On the level Halo, before you exit the cave (To come out the other side and fight a hellacious, seemingly never ending battle to get the the top of the building...) before you get to the drop off which leads to a check point. there is an area in which you can turn right and go into a room that is basically empty besides having one of those eyes that reads scripture to you. a room beyond that would be full of the useless blue lasers. upon leaving this area. There is an area that you will fall to your death EVERY time which consists of a giant blue lazer shooting across near the bottom. You will notice that by looking directly in front of the drop off, there is a ledge that is much to far to leap to on your own...This is where your second player comes into play. Have 1 guy stand right by the ledge, while the other jumps to his death. This will respawn the player that jumped, directly on top of the player standing on the ledge. Now have the player on the bottom jump off the ledge (While the other player is on top of him) and time it right so the guy on top can jump giving him the extra distance to land on the next ledge which was much too far of a jump to reach alone. the next ledge directly across from you can be reached by getting a small running start and jumping. Once you are on the 3rd ledge turn your flashlight on and look to the left ledge. You will see a 2d picture cut out of what appears to be one of the developers dancing. Pretty Entertaining...Pretty Useless...But still an egg.
In Halo 3 multiplayer (this was found in the beta, but I'm pretty sure it'll be in the final release), go to the map High Ground. If you go to the defense base where the flag normally is, there's a room with a machine that types out Morse Code. If you know Morse Code, there are lots of random secret messages, such as Frog Blast the Vent Core. A reference to a previous game.
Also, if you stand in that room for long enough, you'll begin to hear very faint music, that sounds like elevator music.
I guess Bungie wanted some of the defense guys to have something to entertain them while they waited for the enemy to try to invade their base!
First make the primary weapon the sniper rifle or the beam rifle. Start up the map Standoff. Find the moon in the sky and zoom in on it. It is hard to see but there is a face on the moon. The face is also on the Halo 2 map Containment.
1.) Marathon symbol - go to the level "the covenant" and when you are at the elevevators that take you to the barrier controls, look at the "hold rb" thing you will see in a holo outline the Marathon symbol.
2.) reference to the 5th level in Halo 1 - read the description on mission start on the final level in halo 3 it will say "assault on the control room" this was the name of the 5th level on Halo 1.
3.) secret message in the vines - go to forge on guardian and get out of the level, zoom in on the
vine and it will say "blarg" - an rvb reference.
4.) image on plasma grenade - throw a plasma grenade; go to the theatre lobby and look at the pg it has a hippo head which is a reference to Wideload Games.
5.) On the assault rifle bullets - fire one and look at it in the theatre lobby when paused, it will say "CHIEF 3x6xg"
6.) RVB reference - go to Valhalla and look in the water close enough - note you may need to be in forge to do this - look in the scope you will see the alian and caboose talking
In the map sandtrap near the place with 2 bridge things connected to the large bunker things with air portals or jump fans in them, is a place where you get a brute shot, walking away from the air portal bunker thing on the bridge were you get the brute shot, jump on the large tunnel area and turn left. Jump down into a little sniping place, turn around and look down. You will see the oposing person's screen and even what gun he has! Perfect for online play. You will need an assault rifle to see it well. It's awesome.
Start a game on the level The Pit. Go to where the energy sword spawns. Turn around so you're facing the entrance/exit. Look to the right and find a small yellow phone box. Break it off and flip it so you can see the back. On the back there is a tiny windows logo.
Start a level on Construct. Go to the bottom level. On that floor is the same computer from the other blue screen egg on Sandtrap. I also noticed that the 3rd word has a "7" in it.
First, go to the sandtrap multiplayer level.
Then go inside the temple (the one where the elephant is parked). As soon as you're inside, you'll see a two-screen laptop with a UNSC label showing the blue screen of death!