Here’s a Magic Labyrinth, digits 1-4.
Puzzle 29: Magic Labyrinth
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Puzzle 28: Crystal Mine
Here’s a Crystal Mine puzzle, as practice for the upcoming British GP.
Rules Draw a path connecting the two arrows by shading some cells, such that all black circles are on the path, and such that no full two-by-two square of cells is used by the path.
Or see the instruction booklet.
Puzzle 24: Prime Place
Here’s a Prime Place puzzle, another type from the upcoming GP round. Finally a type that forces me to deal with rendering irregular grids! I wonder if we’ll have a hex grid in one of the next rounds?
Rules Place a number between 1 and 4 into each cell, such that each number occurs exactly four times. The digit sum of each horizontal or vertical word must be prime. The digit sum of a diagonal word is prime precisely if that word is marked with a gray diagonal. Here, a word is a maximal straight line of connected cells; words may have length 1.
Or see the instruction booklet.
Puzzle 18: Afternoon Skyscrapers
Another practice puzzle for the GP.
Rules Fill the grid with numbers from 1 to 6 such that every row and column contains all numbers. The numbers represent skyscrapers of the given height. There is a gray shadow at the south edge of a cell if some skyscraper further south in that column would throw a shadow onto the roof of the skyscraper in that cell, with the sun shining at a 45º angle. Similarly, a shadow on the west edge corresponds to sunshine from the west.
Or see the instruction booklet.
Puzzle 15: LITS+
Another LITS+ puzzle.
Puzzle 14: Word Loop
Puzzle 13: Geradeweg
Let’s keep counting, with another Geradeweg.
After the great marathon at LMI last week, how about another one in Budapest later this month?
Puzzle 12: LITS+
Here’s another LITS+ puzzle. I wonder if this one might qualify as “hard”?
Puzzle 10: Araf
This was meant to be an easy Araf puzzle.
Rules Split the grid into orthogonally connected areas, such that each area contains exactly two clue cells, and such that the size of each area lies strictly between the values of the two clues that it contains.
Puzzle 7: Magic Labyrinth
Here’s a small Magic Labyrinth. Can you tell where the 4 doesn’t go?
Maybe Puzzles 