Yes the easy level is way easier than playing on legendary
You can do it on Normal, Heroic and Legendary. You can't do it on Easy.
Normal, heroic, or legendary. I found a two skulls on easy, but I didn't get an achievement.
the level: Cortana on legendary
you can do it on normal, heroic, and legendary, but not easy
Cairo Station
Legendary
Halo 3 depends (campaign-wise) on your difficulty level and fps experience. Easy is well, easy for everyone (hopefully), normal is decent, and good for practice for multiplayer, heroic can be difficult at times, and Legendary can lead to complete frustration. But once you get used to this and the multiplayer, it will become much easier. [Transformers975] It's hard to kill Chieftains or Hunters in any difficulty.
It depends on what difficulty you play on, Easy, Normal, Heroic or Legendary
No it does not. You have to beat every level.
You don't respawn in Halo 2. If one person dies, you must restart from the last checkpoint. At least that's how it is on legendary mode
Different skulls are available on each level. You must be playing on Legendary difficulty for them to appear.
I play Halo Crusades too,I have a level 21 account.If you would like further information,you can contact me.My account name is MageSlayer.Id is 7742. The legendary cards are hidden all around the site,some are really easy to find by just looking around the site and clicking links.Some you have to do something to get the legendary card like attacking 300 level 20+ (this is not a legendary card task,just an example.)I have found 2 cards so far.