Yeah I had to make my own Flag purpose list to keep track of them. Should have realized you guys would need it too.
Flag 0
To turn on: Pick up Level 1 key card in lab 3 quarters
Its effect: Gain access to lab 3 decontamination, and lab 4 lobby
Flag 1
To turn on: Pick up level 2 key card in lab 3 reactor
Its effect: Gain access to lab 2 teleport lab
Flag 2
To turn on: See key blocks in lab 3 reactor area
Its effect: Makes man appear near Icicle Caves
Flag 3
To turn on: See man near Icicle Caves
Its effect: Allows entry to Icicle Caves
Flag 4
To turn on: Get all access card in lab 2 teleport lab
Its effect: Allows entry to Dr. Wood's lab in lab 4
Flag 5
To turn on: Get life relic from lab 4 failed experiment stroage
Its effect: Dr. Wood will give you scuba gear (detector)
Flag 6
To turn on: Talk to ex-scientist in village
Its effect: Prevents that cutscene from playing again
Note: Some flags are used for purposes other than their main purpose. For example, Juni's friend reacts to several flags/power ups, but she doesn't turn any of them on herself.
@ Healy: To give lost players direction, I added clues throughout the labs. They're not blatant, but they're there. There really isn't much we can do to prevent a lot of running around. I considered setting Lab 4's lobby to level 2 clearance, but Lab 4 was the only place I could find to add a clue for where to get the level 2 card. As for the story, I think I've got that covered. Besides the notes on various computers telling the science side of events, Dr. Wood will explain the accident according to his understanding. Another big chunk, will be in the "History" cutscene which gives the local religious view.
more @ Healy: I'll send you the scripts for the cutscenes. From there you can add on whatever you want. Thanks to Evil's mysterious lake, I made Lab 1 submerged which makes putting information on computers difficult. If you want to turn most of it dry that's up to you. I believe Headgrinder and I decided at some point that Lab 1 was built around an existing shrine to the negative energy pole, AKA: death god; but it's not as if we have the final say on everything.
By the way, the umbrella has been hidden in the level. Cutscene making is going great.