Starting with B and moving clockwise, letters advance through the alphabet in steps of 2, then 4, 6, 8 and 10.

Starting with the top segment of the top left square and moving clockwise around the other 3 squares, letters move through the alphabet in steps of 2, with the positions moving one place clockwise each time. Letters in the next segment of the top left square follow the same pattern, in steps of 3 letters etc.

Starting with the bottom right letter and moving in a clockwise spiral around the diagram towards the centre, letters advance through the alphabet six letters at a time.

Read the diagram as a whole grid of 4x4 squares. Starting on the bottom left square, move clockwise around the outside of the whole square, with letters written in sequence, skipping 4 letters at a time. Repeat this instruction for the small inner square.

In each star, start at the bottom and move anti-clockwise around the points. Letters follow the alphabetic sequence, in steps of 8 letters, for the left hand circle, 9 for the right hand one and 10 for the central circle.

Work on the alphabetical order of the letters. First Column: G + 3 = J J + 4 = N N + 5 = S Second Column: Y + 7 = F F + 8 = N. Missing Character = N

Converting each letter to its numerical value, and reading pairs of circles as 2 digit numbers, arranged in two vertical columns, numbers follow the sequence of multiples of 7, starting with 14 and ending with 63. AD = 14 BA = 21 BH = 28 CE = 35 And, DB = 42 DI = 49 EF = 56 So, F? = 63 FC = 63. Missing Character = C.

Working through the diagram in columns, left to right, The sum of the numerical values of the letters in each column follows the sequence 17, 18, 19 and 20. I.e. A + G + C + F = 1 + 7 + 3 + 6 = 17 I + E + D = 9 + 5 + 4 = 18. L + G = 12 + 7 = 19. So, Missing Character = 20. T = 20.

Taking the numerical value of each letter, they follow the sequence of Prime Numbers. So, Next Prime Number,
19 = S.

Work on Alphabetical order of the letters. B + F + L = 2 + 6 + 12 = 20 M + C + D = 13 + 3 + 4 = 20 So, O + A + ? = 20 15 + 1 + ? = 20 ? = 4 = D.

Converting each letter to its numerical value, the diagram represents a subtraction 247 - 54 = 193. So, Missing Character = 1 = A.

Adding 1 to the numerical values of each letter gives the sequence of Prime Numbers.

The 4 diagrams as a whole contain 2 sequences of letters. The first starts at the top of the top left hand diamond, and goes vertically downwards, then up to the top of the top right hand diamond and down again. Letters in this sequence are written in alphabetical order, in steps of 4 letters at a time. The second sequence starts on the left hand segment of the upper left diamond and moves in horizontal lines from left to right, top row then bottom row, with the letters written in alphabetical order in steps of 5 letters at a time.

Convert each letter into its numerical value, and read each row as a 3 digit number. Rows follow the sequence of Square Numbers from 15 to 17. So, BBE = 225 BEF = 256 BH ? = 289 BHI = 289.

Moving down the first column, up the second, down the third etc. letters increase by 7 in each alternate circles. So, Missing Character, E + 7 = L.

Start with the top left square and move clockwise around the others. The sum of the numerical values of the letters in each Circle follows the sequence 20, 25, 30 and 35. A + C + D + L = 1 + 3 + 4 + 12 = 20 M + F + A + E = 13 + 6 + 1 + 5 = 25 L + H + D + K = 12 + 8 + 4 + 11 = 35. So, Q + I + B + ? = 30 17 + 9 + 2 + ? = 30 ? = 30 - 28 = 2 Missing Character = 2 = B

Starting with the letters in the top left square, and moving around the other squares in a clockwise spiral towards the centre, letters advance through the alphabet in steps of 4 letters at a time, with the relative positions of each letter moving 1/4 turn clockwise at each step.

Start at the top left and move in alternate boxes from left to right, then down one row and to the left, in a snakes and ladders pattern. Letters advance through the alphabet in steps of 2, 3, 4...8, and repeat the pattern. Missing Character = V + 2 = X.

In each row, the numerical value of the central letter equals the difference between the sum of the numerical values of the two left hand letters and the sum of the numerical values of the two right hand letters. So, Missing Character, (K + D) - (B + E) = (11 + 4) - (2 + 5) = 15 - 7 = 8 = H.

Working through the diagram in rows, from top to bottom, the sum of the numerical values of the letters in each row follows the sequence 15, 20, 25, 30, 35. So, S + K + Missing Character = 35 Missing Character = 35 - 19 - 11 = 5 = E.

Starting with the A on the left hand side, move around the shape in a clockwise spiral towards the centre. Letters advance through the alphabet in steps of 4, 5 then 6, repeating this pattern all the way around. So, I + 5 = 9 + 5 = 14 = N.

Starting with A and C, as you move clockwise, the numerical value of the next letter equals the sum of the preceding two letters. A + C = D So, C + D = 3 + 4 = 7 = G. Missing Character = G.

As you move left to right, letters appear in alphabetical order, skipping those letters only written with straight lines. Letters which only written with straight lines are: A, E, F, I, K, L, M, N etc. So, Sequence is: B, C, D, G, J, O.

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Work On Alphabetical Order of the Letters. First Column (Top to Bottom): A + 4 = 5 = E E + 4 = I I + 4 = M M + 4 = Q
Second Column (Bottom to Up): Q + 4 = U U + 4 = Y Y + 4 = C. Similarly, Use the Pattern Suggested in the Diagram. And add each time 4 to letter to find the next letter. So, Missing Character = W is S + 4 = W.

Working from left to right, letters move forwards 7 places, then back 2. Repeat this sequence until the end. I.e. A + 7 = 8 = H H - 2 = F F + 7 = M M - 2 = K K + 7 = R R - 2 = P P + 7 = w. Missing Character = W.

Starting on the top left, and moving in an anti-clockwise spiral towards the centre, letters advance through the alphabet by 3 letters at a time. H +3 = K K + 3 = N N + 3 = Q So, Q + 3 = T. Missing Character = T.

Logic (Row-wise): Left element * Right Element = Sum of Alphabetical numbers of letter in Center. 13 * 2 = I + N + C = 9 + 14 + 3 = 26 6 *7 = O + R + I = 15 + 18 + 9 = 42 4 * 8 = D + O + M = 4 + 15 + 13 = 32 7 * 7 = S + U + I = 19 + 21 + 9 = 49. So, 8 * 2 = A + D + ? = 16 1 + 4 + ? = 16 ? = 11 = K. Missing Character = K.

Using the numerical value of each letter, in each column, the value of the central letter equals the sum of the values of the top and bottom letters. So, C + Missing Character = H 3 + Missing Character = 8 Missing Character = 8 - 3 = 5 = E.

Looking at the diagram in columns, letters in the first column are written with 2 straight lines, in the second column they contain 3 straight lines, and letters in the right hand column are written with 4 straight lines.

Work On Alphabetical Order of the letters. D + 8 = L L + 9 = U U + 8 = C C + 9 = L L + 8 = T So, Missing Character, T + 9 = C.