Answers Test 1:
(01. b) 1+(2)=3+(4)=7+(6)=13+(8)=21; Adds even numbers.
(02. b) Lessens from 99 and increases from 1 alternating.
(03. a) Moves forward 1+1/2 wall clockwise.
(04. a) Red: left-right; right-left. White: same place.
(05. a) Red: left-right; right-left. White: from corner to corner, alternating, clockwise.
(06. b) Squares without arrows.
(07. c) Skips 2 letters.
(08. a) Increases number in repeated letter. Alphabetical Order.
(09. c) Black and White: from corner to corner; clockwise.
(10. b) Black: 1/2 wall. White: from corner to corner. Both: clockwise. 
Answers Test 2:
(01. b) Each row with the whole figures.
(02. b) 9-(2)=7+(1)=8-(2)=6+(1)=7. Subtracts (2) and adds (1).
(03. b) Lower figure: same column; upper figure: same row.
(04. b) Lower figure: same column; upper figure: same row.
(05. c) Lines as ascending numbers.
(06. c) (+1)(+1);(+2) (+2);(+3)...
(07. b) Total of the two preceding numbers.
(08. c) Adds the preceding number, then subtracts the preceding one.
(09. a) Add the first two ones up from each row.
(10. a) Circle: from corner to corner, clockwise; line: above/below/above diagonally. 
Answers Test 3:
(01. b) Begins with the last number of preceding square.
(02. b) Left column: same number (1). Right column: increasing numbers.
(03. a) Arrows rotate clockwise.
(04. c) Each arrow rotates same square, clockwise.
(05. a) Hearts and Clubs: clockwise; the other two, diagonally. 
Answers Test 4:
(01. b) (+1), (+2), (+1), (+2)...
(02. c) (+2), (÷2), (+2), (÷2)...
(03. a) (+1), and repeat the total; (+1), and repeat the total...
(04. a) (-18), (+22)
(05. c) (1-3-5-...) alternating with (2-3-4-...)
(06. b) (a-b-c/d-e-f/g-h-i/...) alternating with (o-p-q/r-s-t/u-v-w...)
(07. a) Skips 1, skips 1; skips 2, skips 2; skips 3...
(08. a) Repeats and continues alphabet. 
Answers Test 5:
(01. b) Each domino begins with the last number of the preceding one.
(02. b) (6): doesn't change; (2-2) (3-3) (4-4)
(03. c) Left: increasing (0-1-2-3-4); Right: decreasing (6-5-4-3-2).
(04. c) Left: decreasing (6-5-4-3-2); (6): same.
(05. a) Mirror dominoes: (1-2/2-1) (1-3/...).
(06. c) Increasing and decreasing, alternating.
(07. b) (6): left-right-left-right-left; (1-2-3-4...).
(08. b) (0-0/0-1) increasing; (6-6/6-1) increasing; (0-0/0-2)...
(09. a) Left: increasing numbers; (1): doesn't change.
(10. a) 0+1=(1), 1-1=(0); 1+0=(1), 1-0=(1); 1+1=(2), 2-1=(1)...
Left: Adds preceding domino; Right: subtracts 2nd half. 
Answers Test 6:
1. (c).
Group A shapes are all straight lines.
Group B shapes are all curved.
2. (a).
(Group A) Same color shapes are diagonally opposite.
(Group B) Same color shapes are above/below. 
Answers Test 7:
(01. b) Last ball jumps to join the black one.
(02. a) When the black ball appears, the white one jumps forward the green ball.
(03. c) Same figures alternating.
(04. b) Triangle and circle contrary colors.
(05. a) Figures 1-3-5: above-inverted-above; Figures 2-4-6-...: right-inverted-right. 
Answers Test 8:
(01. c) Arrows point to the corner.
(02. b) 4-sided figures.
(03. c) Circles touch line.
(04. d) Green: left-right-left-right; Red: diagonally; Black: 1+1/2 wall.
(05. d) Inner figures touch the outer ones.
(06. c) Arrows point to corners.
(07. c) Figures should alternate.
(08. d) Black-red-green, clockwise.
(09. d) Inner figures are 4 sided ones.
(10. d) Inner and outer figures with the same number of sides. 
Answers Test 9:
(01. b) Same figure; decreasing numbers.
(02. b) J-Q-K-A; same figure.
(03. b) Red and Black alternating; increasing numbers.
(04. c) From A (1) to 10; 4 hearts, 3 spades, 2 diamonds and 1 club.
(05. b) Black cards: even numbers; each group begins with the two last cards in the former group. 
Answers Test 10:
(01. a) 4(+2)4(-2)=62; 6(+2)2(-2)=80; 8(+2)0(-2)=08...
(02. c) (-12).
(03. c) (-12); 99-89...
(04. b) Mirror squares.
(05. a) Alphabetical order, alternating and repeating last letter.
(06. a) Increasing and decreasing numbers, alternating.
(07. b) Forward and then 1/2 wall backward.
(08. a) One behind the other.
(09. c) Same figure rotating clockwise.
(10. a) Both: corner-center-corner but never in the same wall. 
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Answers Photographic Memory Test 1:
(01) The comb is BLUE.
(02) His trousers are RED.
(03) His eyebrows are WHITE.
(04) He combs himself with his RIGHT hand.
(05) NO, he does NOT wear moustache. 
Answers Photographic Memory Test 2:
(01) His cap is RED.
(02) His gloves are WHITE.
(03) His tie is RED.
(04) He is BALD-HEADED.
(05) There are FOUR letters in his bag. 
Answers Photographic Memory Test 3:
(01) There are THREE stars in the image.
(02) NO, There are NOT blue stars in the image.
(03) There are FOUR people.
(04) There is ONE blond haired person.
Answers Photographic Memory Test 4:
(01) Tamer's boots are BLUE.
(02) Tamer's hat is BLACK.
(03) Tamer's shirt is WHITE.
(04) In his LEFT hand.
(05) There are SIX stars in the image. 
Answers Photographic Memory Test 5:
(01) Man's cap is YELLOW.
(02) Woman's handbag is WHITE.
(03) The bike has ONE rear mirror.
(04) TWO wheels.
(05) There are THREE hands in the image. 
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Answers Exercise 1:
Answers Exercise 2:
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Answer to Einstein's Riddle:
The German owns a little fish. 
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Answer to All-lights Puzzle:
Click on the boxes with an inside (1)
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Answer to Riddle on Cats and Mice:
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Answer to Riddle on Sheep:
The First one had 5 Sheep and The Second one had 7 Sheep. 
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Answer to Optical Illusion:
Duck or Rabbit?
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Answer to Riddle on Fishermen:
Grandfather, Father and Son !!! 
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