Mass Effect 3 Walkthrough
This is my favorite guide on the Citadel. Our Mass Effect 3 Walkthrough covers the entire spectrum of the single player story, multiplayer tips, and how to build a powerful army.
Mars
With only Ashley/Kaidan and James as your team members there is no selection of you can bring. Still, you should have a few points to improve an offensive or defensive power. For the most part just upgrade your team's first skill that already has a free point in it.

Head down the ramps and take out the Cerberus soldiers. The basic Assault Trooper uses assault rifles but has no real defense. Centurions stick to closer range single shot weapons and have protective barriers. For the most part you should take out the weaker Troopers before going for the shielded enemies.

Enter inside the Mars base and you'll soon switch out James for Liara. Use her Singularity to pull the next batch of Cerberus foes out from their cover and finish them off with your guns. After the fight use the vehicle lift controls to raise the stationary car. This along with some nearby boxes will create a bridge to the next area.
Take cover in the next room and stealth kill as many enemies as possible. Still after only one or two hits the rest of Cerberus will notice your presence. They won't be much trouble either way. Head into the security room and take the Ariake Technologies Gauntlets, M4-Shuriken, and med kit before checking the security terminal.

Head outside and pick up the Kassa Fabrication Chestplate while walking between the two ladders ahead. Enter the broken airlock and read the data pad for some free XP. Hide behind the sinks and wait for the next team of Cerberus thugs to open the windows. They will be clustered enough that most all of them can be lifted with a single singularity. Cleanup the rest with your guns before entering the small room on the right. Inside here, grab the medi gel and check environmental controls to open the next passage.

In this next transition area move to the back of the makeshift barrier and acquire some SMG Ultralight Materials. You now need to fight down two long corridor shooters. It's best to use crowd control and very long range weapons. Liara's singularity will be very useful here, as will a sniper rifle from yourself or Ashley. The main enemies to clear out are the Guardians: similar to Troopers but instead carry a giant shield and pistol. However, they are very weak to lifting abilities and attacks from behind.

You'll soon reach a room being sterilized. Wait for the beams to no longer block the doors and hit the controls on either side. Once inside the sterile room, take the Shotgun High Calibur Barrel, XP data pad, and medi gel. Head through the door on the left. Follow Ashley/Kaidan's lead of ducking behind the pillars and boxes to avoid the turrets fire. If you do get hid, wait for your shields to recharge before moving on. Head into the control room and kill the next set of Troopers and a Centurion inside; the small space makes them very easy to hit with area skills. Afterwards, collect the medi gels, XP data pad, and Sniper Rifle Concentration Module.

Hit the control switch in this room and watch the cutscene. Take Ashley/Kaidan's advice and place both of your teammates in a flanking position. Get on the other side of the room and get ready to pincer the enemy. As with the last few fights Liara's Biotics will keep the enemy too busy to deal much damage. Get in the tram and enjoy the ride. That is until you're ambushed yet again. There are only five Troopers so the fight will be over before their tram even comes close. Once Cerberus is taken care of jack their ride to the final combat zone.

This last fight is similar to all the previous ones, but this time the amount of foes will be rather high. You'll mainly need to watch out for the likely number of grenades that will get tossed around the room. Outside of that try to stun and use Liar's Biotics as much as possible. After the fight loot the small room in the center and two side shelves for some medi gel, Shotgun Shredder Mod, and M-15 Vindicator.

Enter through the door and confront the Illusive Man and his agent, Dr. Eva. You don't really need to attack her or fend off the other Cerberus soldiers that try and assist. Just chase after her until reaching the roof. Once Eva attempts to rush you in slow motion just shoot her down to end the mission.




