Reach Dimensional Research
Fast travel back to the Ashtray Maze because with your gift from Ahti, you can now get through. You don't need a walkthrough to get past the maze as it's actually completely linear, just be prepared to kill some enemies along the way.
Search the area for the Slide Projector Object of Power
When you're out of the maze and across the walkway, head further into Dimensional Research and claim the Control Point. Go up the stairs and into the large room with all the sand. Run to the opposite side then use the slope to Levitate and reach the raised platform. Cross over to the other side and go through the door handily marked Projector Room (pictured above). Press the red button to initiate another cutscene.
Go through the next couple of doors and head towards the Hedron Resonance Lab by following the stairs to the top. Interact with the red terminal for another cube puzzle. Here's the solution (also pictured above):
Up, Right, Up, Right, Right, Left
This will trigger another short cutscene. When it's done, head back down the stairs and into the large room with the sand. There's a massive HRA stuck to the door; use Launch to remove it, then another cutscene will start.
Head back down the stairs and into the large room with the sand. There's a massive HRA stuck to the door; use Launch to remove it, then another cutscene will start.
Cleanse the Siphons
There's three Siphons on each corner. They look like satellite dishes; kill as many enemies as you can then interact with each of them in turn. This will activate another Siphon on a ledge, so head up there and do that one, followed by each of the consecutive Siphons that are activated on the upper platforms.
Warning: This part of the game is difficult, because there's so many enemies and not many places to take cover. Make sure you're hitting your shots, utilise all of your abilities – including Shield if you tend to neglect it like me – and retreat to previous areas to gather more health if you need it. When you cleanse the final Siphon, use Levitate to climb to the top of the platforms and trigger a cutscene.
Main Missions:
Control walkthrough: Welcome to the Oldest House
Control walkthrough: Unknown Caller
Control walkthrough: Directorial Override
Control walkthrough: Old Boys' Club
Control walkthrough: Threshold
Control walkthrough: My Brother's Keeper
Control walkthrough: The Face of the Enemy
Control walkthrough: Finnish Tango
Control walkthrough: Polaris
Control walkthrough: Take Control
Side Missions:
Control walkthrough: Old Friends
Control walkthrough: Fridge Duty
Control walkthrough: Self-Reflection
Control walkthrough: Mr Tommasi
Control walkthrough: Old Growth
Control walkthrough: A Matter of Time
Control walkthrough: Langston's Runaways
Control walkthrough: The Enemy Within
Control walkthrough: Mold Removal
Control walkthrough: What a Mess (all missions)
