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Exit Sentries

Defeat the guards and unlock the door.

Version 2:
- Added a glass wall in the main area so players can see the gel dropper
- Much fewer un-portalable panels
- Fixed it so you can't get stuck at the exit

Version 3:
- Fixed it so you can't get stuck in the alcoves near the gel dropper
- Removed some potential exploits and unintended red herring panels
- Made it so you can put a portal on the funnel from the timed flip panel area without having to walk around, but without allowing the player to portal into it

Version 4:
- Fixed it so that the "escape tunnels" around the gel dropper were no longer needed
- Converted the solid platform around the excursion funnel to a grate, making it much easier to shoot a portal up there

Version 5:
- Redesigned the area above the entrance: made it a little harder, removed an exploit that made the gel unneccessary, fixed the player getting trapped at the flip panel
- Adjusted lighting in some areas

Let me know in the comments if you find an exploit.