Japanese portal TRILL has published a matchstick puzzle featuring the faulty sum 8 + 62 = 69, challenging players to fix it in one move.
The problem presents an incorrect addition, because eight plus sixty-two actually equals seventy rather than sixty-nine. Although the calculation is wrong by only a single unit, solvers cannot resolve the teaser simply by altering the final digit of the sum.
Instead, readers must examine the entire equation to understand how adjusting one number influences another. According to the rules, all digits and operational signs are formed using matchsticks. Players must relocate exactly one stick to make the equation true, without discarding any pieces or introducing new ones from outside the board. Every figure must retain a correct, recognizable shape after the move, and the addition symbol cannot be altered.
Solution to the equation
To reach the correct answer, the player must adjust both the first number and the final result. The first step requires taking the top right vertical matchstick away from the digit 8 at the beginning of the equation. Removing that single piece instantly turns the eight into a six.
The player must then carry that removed matchstick over to the last digit of the number 69. Placing the stick vertically in the lower left section of the digit 9 transforms it into an eight. That change converts 69 into 68, while the initial addend 8 is now 6.
This adjustment leaves the player with the balanced equality 6 + 62 = 68. Both sides of the mathematical statement now match perfectly, as six plus sixty-two equals sixty-eight. A single movement successfully corrects two separate numbers without modifying the original plus sign.
Background and related puzzles
Matchstick arithmetic problems are a long-standing staple of casual gaming and mental training, relying on the geometry of seven-segment displays. In these layouts, each digit from zero to nine is formed by up to seven straight lines, mimicking the readouts found on digital clocks and pocket calculators.
TRILL operates as a Japanese lifestyle portal, publishing brain teasers alongside daily lifestyle and culture features. Ukrainian news agency UNIAN, based in Kyiv, shared the puzzle as part of its regular coverage of online riddles that test observation and problem-solving skills.
UNIAN reported that its platform features another matchstick puzzle with an obvious mistake that allows only one stick to be moved. The agency also pointed readers toward other math teasers, including repairing the subtraction equation 0 - 88 = 86 with a single match, finding the unknown in x : 2 = 8 : x, and calculating 7 + 7 : 7 + 7 x 7 - 7.
