Here’s a pair of practice puzzles for the upcoming Bulgarian GP.

**Rules** Solve as a regular skyscrapers puzzle. In addition, all even clues are given. (That is, any missing clues would be odd numbers if given.)

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Here’s a pair of practice puzzles for the upcoming Bulgarian GP.

**Rules** Solve as a regular skyscrapers puzzle. In addition, all even clues are given. (That is, any missing clues would be odd numbers if given.)

Here are a couple of puzzles of widely varying difficulty that I made for the hybrid type Standard / Touching Slitherlink that featured in Round 8 (Twilight) of WPC 2019. I could have sworn this variant existed somewhere on the Rätselportal or in the Logic Masters archives, but I couldn’t find it. It’s quite similar in some ways to related hybrids like “Außen-Knapp-daneben-Rundweg”, but has some quite novel features.

**Edit** Added a clue to the 3s-puzzle to save the intended break-in.

**Rules** Draw a loop by connecting grid points as in standard Slitherlink. Clues inside the loop act as standard Slitherlink clues (i.e., they count adjacent edges that are used by the loop). Clues outside the loop count how often the loop visits the boundary of the cell, as in Berührungsrundweg (e.g., a clue 4 means that the loop uses all of the cells corners but none of the sides).

Or see the instruction booklet.

[puzz.link without answer check]

Here’s a Five Cells puzzle with the extra rule that the same pentominoes can’t touch along an edge, as for Pentominous puzzles.

And here’s a Geradeweg with unequal lengths.

**Rules** Solve as a regular Geradeweg. In addition, any two straight segments which meet at a point must have different lengths.

Another loop type in the unequal lengths variation:

**Rules** Solve as a regular Country Road. Additionally, any two straight segments that meet at a point must have different lengths.

Continuing with the variant rule from the recent GP, here’s a Masyu [unequal lengths].

**Rules** Solve as a regular Masyu puzzle. In addition, any two straight line segments that meet at a corner must have different lengths.

This past weekend, the WPF hosted round 4 of the 2019 Puzzle Grand Prix, with puzzles by Russian authors. Puzzles/solutions/results are currently available under the previous link but should show up in the archive eventually. I’ll go over how it went for me below. One very interesting new variant on the test was “unequal lengths slitherlink”; here’s one:

**Rules** Solve as a regular slitherlink. In addition, any two connected straight line segments must have different lengths.

Next one, a Semitransparent Snake. This was hardly worth constructing, since the competition puzzle was only worth 20 points. Also the type is somewhat dreadfully confusing. But, enjoy!

**Rules** Connect Start to Finish by a standard snake. Clues count the visible snake cells. Along any straight segment of snake cells (in the direction start to finish), every 4th cells is invisible (from both directions).

Or see the instruction booklet.

Next WPC preparation puzzle, this one from round 5, Variations. You might as well call it a First Seen No-Islands Tapa.

**Rules** Shade some empty cells to form a Coral, compare Puzzle 27. The clue cells count as empty cells for the coral and can not be shaded. They indicate the lengths of the first blocks seen in each of the up to four directions.

Or better see the instruction booklet.

Another WPC practice puzzle here, again from the Skyscraper themed round. It’s a pretty nice variant, though somewhat susceptible to uniqueness arguments. (Try it without, though!)

**Rules** Fill each row and column with numbers from 1 through 5 as well as a single diagonal mirror. Clues act as regular skyscraper clues, but follow the mirrors.

Or see the instruction booklet.