Logic Masters Deutschland e.V.

This puzzle is the result of a collaboration with my buddy Pokitchayng. He does not have an account here (yet), but you can find him on the CTC Discord.

Assignment #1: Welcome, new recruit! You have been assigned to an enclosure with our newest semi-aquatic snake, Mr. Slithers. This particular reptile has a knack for hiding—in fact, you will have to work out exactly where he is in the habitat. We have provided you with a blank diagram of the enclosure. Please notate the current water levels and use them to track the location of Mr. Slithers.

Rules: This puzzle combines aquarium and snake rules.

Aquarium:

• Each bordered region is an aquarium, and cells must be shaded blue (water) and green (air).
• Within a region, any cells that are in the same row must be the same color.
• When a row of cells within a region is filled with water, all cells below that row in the region must also be filled with water.
• Regions may be entirely water or entirely air.

Snake:

• Place circles in cells (or use another technique) to form a single 1-cell wide snake.
• The snake cannot touch itself orthogonally or diagonally.
• The two ends of the snake are marked by black circles.
• No set of 3 consecutive snake cells may be all water or all air. For example, if the snake passes through two water cells in a row, then the next cell on the snake’s path must be air (Mr. Slithers has to breathe!)
• Every region must contain at least two snake cells.

External Clues:

• Numbers outside the grid indicate the number of water cells and/or the number of snake cells in the corresponding row or column (a number can signify the amount of water cells, snake cells, or both).

Example: An example puzzle and solution are included for your reference. We found that Penpa+ with circles and lines for the snake was the most user-friendly.

Here is the main puzzle. Good luck!

• Penpa+ (Shade air cells green and draw a green line through the snake for answer check)
• CTC
• F-Puzzles

If you get stuck, rereading the rules can be helpful!