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The Most Difficult Tasks (page 9)puzzles, riddles, mathematical problems, mastermind, cinemania... These are the tasks listed 81 to 90. |
Find the right combination
. Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.','/archive/2026/05/19/mastermind-1779149101.png','/Find-the-right-combination/8722'))
The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot. Calculate the number 8179
. Each of the numbers can be used only once.','/archive/2026/05/18/numbermania-1779062701.png','/calculate-the-number-8179/8721'))
NUMBERMANIA: Calculate the number 8179 using numbers [3, 6, 3, 7, 85, 843] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once. Find number abc
)
If abb7a + ca741 = 1a431c find number abc. Multiple solutions may exist. 
A man walks into a bar and orders a free drink
The man then whispers "I have a 10 inch pianist in my pocket, and he can play a little jig for you. If I can prove that, can I get the drink then?"
The bartender ponders, but then agrees. The man pulls out the pianist, and he plays "The Entertainer" before hopping back in the man's pocket. Baffled, the bartender gives him the promised free drink.
The man whispered "I also have a magic Genie, who was the one that gave me this pianist. If I let him grant you one wish, can I get another free drink?"
The bartender, already in shock over the tiny piano man in his pocket, agrees. The man pulls out a lamp, and out comes a Genie, ready to grant wishes.
The bartender exclaims "I want a million bucks!" And all of a sudden, a million ducks enter the bar.
"Ducks?! I didn't want ducks!" The bartender shouts. The man looks at him, dead in the eyes and says "You think I wanted a 10 inch pianist?"
Which is a winning combination of digits?
. Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.','/archive/2026/05/16/mastermind-1778889901.png','/Which-is-a-winning-combination-of-digits/8719'))
The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot. 
Calculate the number 2222
. Each of the numbers can be used only once.','/archive/2026/05/15/numbermania-1778803502.png','/calculate-the-number-2222/8718'))
NUMBERMANIA: Calculate the number 2222 using numbers [1, 2, 4, 9, 70, 532] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once. MAGIC SQUARE: Calculate A-B+C
 into the empty squares and squares marked with A, B an C. Sum of each row and column should be equal. All the numbers of the magic square must be different. Find values for A, B, and C. Solution is A-B+C.','/archive/2026/05/14/magic-square-1778717147.png','/MAGIC-SQUARE-Calculate-A-B-C/8717'))
The aim is to place the some numbers from the list (8, 12, 13, 28, 32, 33, 38, 42, 43, 52, 61) into the empty squares and squares marked with A, B an C. Sum of each row and column should be equal. All the numbers of the magic square must be different. Find values for A, B, and C. Solution is A-B+C. Find number abc
)
If 4baab + 537bc = 1030a7 find number abc. Multiple solutions may exist. What a winning combination?
. Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.','/archive/2026/05/12/mastermind-1778544301.png','/What-a-winning-combination/8715'))
The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot. Calculate the number 595
. Each of the numbers can be used only once.','/archive/2026/05/11/numbermania-1778457901.png','/calculate-the-number-595/8714'))
NUMBERMANIA: Calculate the number 595 using numbers [2, 1, 8, 7, 66, 516] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once. Find number abc
)
If 39094 + 5aa93 = 90b8c find number abc. Multiple solutions may exist. 
