Puzzle 90: Antimatter

Dual Masyu Follow regular Masyu rules. This is a loop puzzle: Draw a loop that passes some of the cells such that the loop never touches or crosses itself, the loop only turns on cell centers, and the loop only makes 90-degree turns. The loop must pass all circles. When it passes a white circle, it must go straight, but must turn either before or after (or both). When it passes a black circle, it must turn, but must go straight both before and after it.

Additionally, this puzzle is two in one; it has two solutions that are coupled in the following way. Gray circles are two circles that have different colors in the two puzzles; if a gray circle acts as a white circle in one puzzle, then it must be black in the other, and vice versa. (In either puzzle, two gray circles may act as one white and one black; they don’t need to act as the same color.)

Expected difficulty Medium • Answer • Comment/E-mail if you want a solution to be published

Puzzle 90: Antimatter
Dual Masyu

No particular comment; just toying with interesting things.

Deception Preview 2: A Chaotic Order of Circles

Semi-liar Masyu Draw a loop where all segments are parallel to the edges of the grid, turning only at cell centers. The loop must pass all circles. At a black circle, the loop must turn but may not turn at the squares exactly before it and after it. At a white circle, the loop may not turn but must turn either at the square exactly before it or after it (or both). In addition, every second circle that the loop passes has an incorrect color and should be the other color (white if it’s black and vice versa).

Answer key: Enter the lengths of the horizontal/vertical line segments in the row/column respectively. Enter 0 if there is none.

Difficulty 3.0/10 • Target times 01:30 03:00 07:30 20:00
Solution Answer key (highlight →) 211,6 • PNG (not uploaded) • ZIP of PDF (not uploaded) • DOCX (not uploaded)

Deception Preview 2: A Chaotic Order of Circles
Semi-liar Masyu

Second preview puzzle. Perhaps one of three or something puzzles that don’t have any certain theme.

*checks archive*

Well, seems like there are indeed only three that doesn’t have any theme, and only one will appear in the test. Whee. I have too high standards of aesthetics.