# Puzzle 161: Semitransparent Snake

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.

# Puzzle 160: Condensed Dominos

I’m starting to question my choice of posting all the linkable practice puzzles before the corresponding WPC review post… This is a great take on the standard Domino dissection puzzle that keeps the core while making it logically richer and less susceptible to uniqueness deductions.

Rules Partition the grid into areas of size three, such that each domino can be placed within one of the areas.

Or see the instruction booklet.

# Puzzle 159: Inner Coral

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

Inner coral

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.

# WPC 2018 review, part 1

The 27th WPC is over. Like the last time I did this, there’ll be some criticism (as there would have been for the two past years), so let me thank the authors and organizers right away for the terrific job they did. I’ll go through the competition round by round again, covering rounds 1 through 3 (morning of day 1) in this post.

Like last time, I’ll compare to the 10th best score of each round. That value is reasonably unaffected by the out-of-this-world scores at the very top.

# Puzzle 158: Skyscrapers with Mirrors

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!)

Skyscrapers with Mirrors

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.

# Puzzle 157: Skyscrapers, First Invisible

While I’m writing up some notes on the recent WPC (team gold yay!), here’s a practice puzzle I made, for the skyscrapers round. It’s quite a neat variant, called “first invisible”.

You can solve online (but be warned that the solution isn’t checked correctly).

Rules Fill the grid like a usual skyscrapers puzzle. However, instead of counting visible buildings, clues indicate the first non-visible building from that side.

Or see the instruction booklet.