# 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.

# Puzzle 151: Skyscraper-Nurikabe

We continue with the regular puzzle-a-month-on-the-first-of. Here’s a Skyscraper-Nurikabe, a practice puzzle for the upcoming Indian GP.

Rules Solve as a regular Nurikabe. Additionally, some skyscraper clues are given outside the grid. For these, consider the blocks of adjacent shaded cells within the corresponding row as skyscrapers with height equal to the number of cells in the block.

Or check the instruction booklet which includes an example.

You can solve online (of sorts) and check your code here.

# Puzzle 149: Skyscrapers²

The WPC 2017 in Bengaluru is over. Here’s a puzzle from my very thin set of preparation puzzles. It’s from a round with original types that applied the same set of rules “twice over” in a sense.

Rules Solve the grid as a regular skyscrapers puzzle, digits 1 through 5. In addition, small clues in the outer corners are skyscraper clues for the regular skyscraper clues along the outside. These 20 regular syscrapers clues are part of the solution.

For example, the regular skyscraper clues along the left side could be something like 1,3,5,2,2 to satisfy the second-level 3 clue in the top left corner.

Or see the rules of Round 20: Puzzle Fusion in the WPC instruction booklet, available at the WPC page. You can find an example there, too.

You can check your solution and solve online here.

# Puzzle 131: Skyscrapers (with parks)

Here’s another skyscrapers puzzle, this one with rather many parks. They feel quite different.

# Puzzle 129: Skyscrapers (with parks)

A companion skyscrapers puzzle to puzzle 119. This was the first one I made, 119 was meant to be easier, but still too hard.

Buildings of size 1-9 and one park (gap, invisible) per row and column.

EDIT fixed shifted clues along the top.

# Puzzle 120: Hochhausblöcke

Some more Hochhausblöcke. In other news, the 10×10×10 series on croco-puzzle continues, and I submitted a few puzzles to the excellent puzzlepicnic, including a Fences puzzle where I’m curious to know if people find the intended break-in, and a Yajilin.

Rules Place numbers from 1 to 4 in each cell so that each row and column of each 4×4-block contains all numbers 1 to 4. Circled numbers are valid skyscraper clues for the adjacent grid (for both adjacent grids in the central corners). Uncircled numbers are not valid skyscraper clues for the adjacent grid (for neither adjacent grid in the central corners).

# Puzzle 119: Skyscrapers (with parks)

Here’s a skyscrapers puzzle. This is from a batch of puzzles I recently made for a series on croco-puzzle, consisting of 10 puzzles on 10×10 grids. I thought it was a nice opportunity to try my hands at making a large skyscraper puzzle, after some failed attempts in the past. The difficulty turned out such that it didn’t really fit with the rest of the series, so here you go.

Buildings of size 1-9 and one park (gap, invisible) per row and column.

# Puzzles 107, 108: Hochhausblöcke

To make it a full two weeks of post-LM posts, here are two more Hochhausblöcke. One with the maximal number of givens, one with the minimal number. (There are some more of each, but these are the nicer ones. The minimal one requires a well-placed deep case distinction, or I do at least.)

Rules Place numbers from 1 to 4 in each cell so that each row and column of each 4×4-block contains all numbers 1 to 4. Circled numbers are valid skyscraper clues for the adjacent grid (for both adjacent grids in the central corners). Uncircled numbers are not valid skyscraper clues for the adjacent grid (for neither adjacent grid in the central corners).