# Puzzle 137: Lamps

Just a tiny puzzle that I made as an example for the croco WPC preparation series. It was a bit too hard as an example; the type seems inherently hard.

Rules Place some lamps in the empty cells around the grid, with brightness 0 to 3. The lamps shine horizontally, vertically and diagonally in eight directions. In each direction, they illuminate as many cells as they are bright. Numbers inside the grid indicate how many lamps illuminate the corresponding cell.

The WPC instruction booklet has an example.

# Puzzle 110: Greater Wall

The next round of the Puzzle GP takes place next weekend, with the Dutch round authored by Bram de Laat. The instructions are out; it turns out Maxi Loop is one of the types (see Puzzle 91 and Puzzle 109), so we’ve got that done. One of the less familiar types is Greater Wall, compare Bram’s set for the Polish championships. The presentation has been much improved, with explicit placeholders. Here’s one.

Rules Shade some cells to form a wall that is connected by edge and doesn’t contain any 2×2-square. Where given, clues outside indicate all connected blocks of shaded cells in the corresponding row or column, in the correct order. Relations between two placeholders apply to the lengths of the corresponding blocks.

# Puzzle 87: Tom-tom

One more Tom-tom puzzle. That’s it for the series.

Rules Fill the grid with digits 1-7, so that no digit repeats within a row or a column. (Digits may repeat within rooms.) Clues indicate the result of applying a basic operation (addition, subtraction, multiplication, division) to the digits within that room, starting with the largest digit.

Or see the instruction booklet.

# Puzzle 86: Tom-tom

One Tom-tom puzzle.

Rules Fill the grid with digits 1-7, so that no digit repeats within a row or a column. (Digits may repeat within rooms.) Clues indicate the result of applying a basic operation (addition, subtraction, multiplication, division) to the digits within that room, starting with the largest digit.

Or see the instruction booklet.

# Puzzle 85: Nanro Signpost

One more Nanro Signpost.

Rules Shade some cells, so that all shaded cells are connected, and such that shaded cells don’t fill any 2×2 square. Clues indicated the number of shaded cells in an area; each area must have at least one shaded cell. Whenever two shaded cells touch across walls, the number of shaded cells within both areas must be different.

Or see the instruction booklet, with a somewhat different formulation of the rules.

# Puzzle 84: Nanro Signpost

One more practice puzzle, a Nanro Signpost.

Rules Shade some cells, so that all shaded cells are connected, and such that shaded cells don’t fill any 2×2 square. Clues indicated the number of shaded cells in an area; each area must have at least one shaded cell. Whenever two shaded cells touch across walls, the number of shaded cells within both areas must be different.

Or see the instruction booklet, with a somewhat different formulation of the rules.

# Puzzle 83: Pentominous Borders

Another Pentominous Borders, presumably closer to what we’ll get on the GP.

Rules Split the grid into pentominos by placing some walls between cells. Pentominos that touch by an edge must be different, where two pentominos are considered the same if one can be rotated and/or reflected to become the other. Some walls are already given. Black cells aren’t part of the grid.

Or see the instruction booklet.