SPOILER: Diggy's 6th BDay: Keys + Gate Solutions + Undersea Lasers

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GATES to LINDA:
I http://prntscr.com/jfiiwb
II http://prntscr.com/jfij7l
III http://prntscr.com/jfijor

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UNDERSEA FACILITY LASERS

To solve these, pay close attention to the color of tile the laser, mirrors, and stones are on. Each control slider corresponds with a tile color. So, if the laser is on a BLUE tile, use the BLUE slider to turn it. Same goes for the mirrors and stones that change the laser color.
TREASURE: http://prntscr.com/jfnmp8

YELLOW LASER: http://prntscr.com/jfpy6v
(also turn on all fans/propellers in adjacent room to get the B—Day key)

3 COLOR:
Red: http://prntscr.com/jfno6w
Yellow: http://prntscr.com/jfnp18
Blue: http://prntscr.com/jfnpet

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FUTURO FOREST BUILDING CODES
BUILDING 1: http://prntscr.com/jft0p9
http://prntscr.com/jft189

BUILDING 2: http://prntscr.com/jft5h5 http://prntscr.com/jft67y

To get stone onto scarf (bday key):
1. http://prntscr.com/jg355k
2. http://prntscr.com/jg35zm
3. http://prntscr.com/jg36ob

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PROFESSOR HEADQUARTERS

GATE 2: Step on the hidden panels across from red marks to reveal the code. https://prntscr.com/jk25h1

GATE 3: To get the code, step on panels across from the red marks PLUS panels around the room. http://prntscr.com/jftqqf

GATE 4: You must turn the electricity back on with the electrical boxes. Then step on the hidden panels to get the color code.
https://prntscr.com/jfuw87

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CHALLENGES

CHALLENGE 1: To solve this, the colored tiles represent the stone color. The flowers AROUND those tiles represent the proper stone placement.
http://prntscr.com/jgv7eb
https://prntscr.com/jfv0yx

CHALLENGE 2:
https://prntscr.com/jgvoe0

CHALLENGE 3: Mirrors: https://prntscr.com/jgvh9t
Sign code: 2764

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BACK IN PROFESSOR'S CABIN

Find the differences: http://prntscr.com/jgnxi1

REWARD ROOM ENTRANCE:
http://prntscr.com/ji9bmv

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CAN'T GET BACK TO PROPELLER ROOM?
UNDERSEA FACILITY:
there are 2 entrances to that room. One from the "top" closest to the yellow laser puzzle, the other from the bottom.

From the floor that has the 3 lasers to solve, exit from the top door:
http://prntscr.com/jh03ii
And enter the bottom door of the propeller room:
http://prntscr.com/jh04z7

TREASURE: You point a laser at the gray stone sitting on top of the treasure platform. One had to go thru a door and cross a long hallway/ bridge to get to the treasure room door....
TREASURE: http://prntscr.com/jfnmp8
Start the video at about 7:00 to gauge the floor you're to be on. Then at 8:48 Diggy enters the long hallway /bridge to get to the room with the treasure.
https://www.youtube.com/watch?v=gGe1tj7L2UE&list=PLGGiGDh_SgnucLpo-EuleXrYsnKIYw5RL&index=4

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REWARD ROOMS:
Are found by going through the refrigerators/vents of various locations. Each room is blocked by Ulrika, who won't move until you find the items she requests.

Villain's Mansion: glue
Future Forest: rakes
City of Digg'ten: scrap metal
Undersea Facility: orange pylons
Digg'ten Desert: USB sticks/thumb drives
Professor's HQ: fire extinguishers
Back in Professor's Cabin: shoes, dress, scarf

Thanks to @sep780>

BlameTheParrot

DETERMINE MISSING TREASURE PIECE
Click on the Treasure in your museum (or wherever they are on the computer version of the game.) An info window appears with clickable icons that show which location the treasure piece is in.
Just keep in mind that treasure pieces never count as tiles, so the location can say it's complete despite the missing piece(s).

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6th BIRTHDAY ACHIEVEMENT
All Event Achievements require collecting from the Challenge locations. You can just dig a path to the computers if you choose.

60 computers are required to complete the Achievement.
Finishing the Main Story gives you 46.

Challenge 1 has 8
Challenge 2 has 9
Challenge 3 has 11
Total 74
http://wiki.diggysadventure.com/index.php?title=Events