Tyndis playing the 8th mission on Heroic. The city of New Alexandria is undergoing glassing and the Covenant have placed radar jammers around the city. Your job is to take them out. This is probably one of the most awesome missions in the game, especially because of the aerial-ground aspect.
Tyndis playing the 5th mission on Heroic. This mission features the largest onscreen AI in a Halo game. Wide vistas and epic battles ensue as you push to take out a Covenant teleportation device.
Tyndis playing the 4th mission on Heroic. You and Jun go on a sniping reconnaissance mission to find out what the Covenant are up to. This level is reminiscent of Truth and Reconciliation from Halo CE.
Tyndis playing the 9th mission on Heroic. Noble Team arrives at Sword Base to find a change of directions that leads them to learn the true meaning of their mission. This is the shortest mission, but it reveals many mysterious and secrets about the game and universe.
Tyndis playing the 10th mission on Heroic. You and Emile must escort the Package to the Pillar of Autumn waiting in a shipwrecking yard. This is one of the most beautiful and epic levels. It's also one of the most challenging as well.
Tyndis playing the 6th mission in the Campaign on Heroic. Kat comes up with a crazy plan for you to take the fight to the Covenant and detonate an explosive device inside of one of their cruisers above the planet's orbit. This is also the first and only mission in a Halo game that introduces a new medium of combat.
If you just want to watch spoiler-free Campaign missions, don't watch the rest of this mission.
Tyndis playing the first 2 missions of the Halo Reach campaign on Heroic. Noble Team is called to investigate a possible terrorist attack on a communications outpost that goes offline. Unfortunately, it's the Covenant who have landed on Reach undetected instead.
This is Tyndis playing the 7th mission in the Halo Reach Campaign. When you regain consciousness after your free-fall from orbit, you make your way to a city that's engaged by the Covenant and is being evacuated.