[Font]

the dashes are just continuous lines .. no spaces.

Here are the missing letters (underscore)

 _ _ _ N O _ _ _ _ A R T _ _ _ _ _ _ _ I S _ _ _ _ _ _ K E Y

[Cheat Dice]

@jasen..nice start

Note that a cheat die may have the center magnet pip on its 1 or 3 or 5 , since the polarity of magnet's exposed side  is either (+) or (-), the opposite sides 6 or 4 or 2 can be heavier or lighter too. Thus there are just 3 ways to test the N / H / L weight of the die. 

Your procedure mostly  can try the 1st right die x3 tests,the 2nd right die x3 test,the 3rd right die x3 test.
Or total of 9  tries. Same with a weighing scale : 1st die- N,N,H/L   2nd die-N,N,H/L  3rd-N,N,H/L. Luck aside.

Surely the no of trials can be lessen..

[Cheat Dice]

 

                                     

Three of the above  standard dice of know weight has a magnet pip on center of one side.
These cheat dice  weigh normally when measured on top of the throwing table with induced magnetic 
field but would be 1 unit heavier or lighter when the magnet pip is facing  (parallel with) the table.
With  balance scale  and/or weighing scale available..what is the best method  to sort out the fair die.

[Relative Time]

What's the watch speed if it runs backward 1sec/sec relative to your stationary real  time?

[Font]

 

gender clues: 

1.m 17.n
 2.m 18.m
 3.f   19.f
 4.m 20.f
 5.m 21.m
 6.f   22.m
 7.m 23.m
 8.f   24.f
 9.f   25.f
10.f  26.m
11.f  27.n
12.m 28.f
13.n  29.f
14.f   30.m
15.f   31.f
16.f   32.m

[The Coc'ks Clock]

..that's all.

[The Coc'ks Clock]

@bonanova..Right question..its means pointing to the middle of an arc joining  1 and 2. I think the chicken can't figure that..but can view it as the "distance of  a 1 to hour hand's tip is equal to the distance of a 2 to the hour hand's tip".

@wg..i.e if both hands points to the middle

@harey..yes 0:00,6:00,12:00 are counted.. but it's more than eleven. Can you find the other?

[The Coc'ks Clock]

              

The Rooster crows every time the hour hand points exactly between 1 and 2.
How many coock-a-doodle-doos shall it make from midnight till noon?

[Marathon (mini) puzzles (trapped in a dungeon)]

should try atlantis,eden, mc donald's..

[Need directions]

a battery, a piece of copper wire and a ferrous pointer might be inside the clock ? then maybe a prisoner with glass of water can help..

[Weighing Bells]

Hi CaptainED

Actually it is a "case1a" as stated from the OP..Can this be done in 4 or less?

I almost forgot what B) ask..its like placing the bells on the scale and wish (granted)

that the would be balance or one pan up or one pan down..so that on the next weighing

all bells are identified.

[Font]

---NO-----ART-------IS--------KEY

Complete the message above by decoding the character clues below:

 

[Minimize the perimeter]

For first thought..will it fit  in a 9 x 10  with 1 blank square inside or corner?

[Half-balls]

All cleared . Good job !

What's the better weighing machine?

[Half-balls]

Hidden Content

Right but don't miss the solution for using the digital weighing machine..

[Half-balls]

A bearing factory cuts four steel balls into halves with a gram or 1% difference in weight due to laser error.
The eight pieces were all mixed up in a collecting bin and shall be paired into 4 similar spheres..
Using the balance scale and/or the digital scale..How can it be done quickly?

[Triangle with a given perimeter]

beats me..

Looks like a very fine puzzle!

[Triangle with a given perimeter]

measure MC length

measure the 2 angles formed with vertex C

apply sign law for triangle, calculator is needed.

4 unknown lengths, compute angle form with vertex M

Use compass and straight edge to make that angle on the ground

[Triangle with a given perimeter]

For field work using Meter tape 
as compass and ruler.

given length p..
make the cutting lines from M
let intersection points be c1 & c2 )
measure C-c1 , C-c2 & c1-c2
add and compare to p..

adjust c2 along its line
measure C-c1 , C-c2 & c1-c2
add and compare to p..

repeat until distance sum=p is ok

[Using only a straight edge]

starting  with 3 points..
connect P  to diameter ends to make the points 4 & 5 on circumference
connect these points to opposite diameter ends to make intersection (point 6)..
Draw an extended  line from P thru 6 crossing diameter..

 

[Lock spell]

                                     

To unlock safe : Turn the knobs to  figure out the right combination. What are the 8 words?

[Center of Gravity]

Lets see..

 

Not like how I imagine it ( center of gravity in x-y-z symmetry). But that is better!

 

The flat solution is to turn around the right side stick of top box..that will make the top box

and the lower right box symmetrical.. and the rest  are easy to form one like that of bonanova's "pisces"

 

 

[Center of Gravity]

matchsticks2.jpg

When we cut it half through the center at any angle the two parts are the same shape or configuration..

[Center of Gravity]

Best I can do is to change four matches.

match4.gif

Almost that is it!

[Center of Gravity]

This is a simple mechanics+ geometry puzzle..

I'm not sure if the "2015 MIT Mystery Hunt"  is a type of metapuzzle?