Here then the walk through for the 7th level of 100 missions:
Take the set of diving fins in the top right corner.
Go right and tap the lady. She tells you about 3 numbers: 714.
Go back right and click on the locker with the number lock. 3 of the numbers are 714. I got the first number – 9 – by using brute force. So select 9714 on the lock and it will open. Take the large red fire extinguisher.
Go left and forward.
Use the fire extinguisher on the fire.
On one of the lockers you will see the code: 1,8,70,627
You need to find the next number in the sequence. If you battle, the answer is 5639.
Why 5639? à 1 * 9 – 1 = 8. 8 * 9 – 2 = 70. 70 * 9 – 3 = 627. 627 * 9 – 4 = 5639!
Open the locker with 5639 then take the key, sheet of paper containing colors and numbers, and oxygen tanks.
Go back to the room where you started. There is a locked bag on a box. Use the silver key to open. Take the hammer.
Go to the 1,8,70,627 – locker. Use the hammer to take off the locker door.
Go to the room with the steel stairs. Look at the stairs then use the locker door to fix.
Climb the stairs, and then take the diving goggles. Use the hammer on the bottom left crate. Take the length of steel chain. Take the dark metal key on the hand rail.
Use the key to unlock the lock next to the lady.
Use the chain on the hook.
Look at the DB board. Use the sheet of paper containing colors and numbers to resolve this puzzle!
If you tap a button once it will be red, tap again and it will be yellow. Tap again and it will be blue. Tap again and it will be off. For the below, the colums are from left to right, and the rows from top to bottom:
The first number under each color is the column number; the next number is the row number. SO column 1, row 2 must be red. Column 2, row 5 must be red. Also red will be column 3 row 1 and column 4 row 4. Do the same with yellow and blue.
You will see a hint for the last puzzle: the arrows up, down, up.
Go check under the stairs and change the middle lever of both the top and bottom row to point down (tap twice).
Go back to the cage room and the pool will be full of water:
Tap the water and congratulations!