Halo 2 literally hast he most/best skulls in all the games, but now Halo 3 adding on top of that the most difficult skulls, while also proving that you in fact, can add more skulls later after a game release. I would hope 343i intends on adding more to Infinite as well, and not just difficult ones, but the fun ones as well.
The ability to fly, shoot rainbows, an already added Infinite ammo. They can benefit from replayability. Though not just campaign, skulls can be implemented into firefight to make the game more challenging and even fun as well.
Do you guys have any skulls you wish can return or any new ideas?