Examining the intricate interplay of thermometers, Hot Cycles also appears in Indigestion Collection 2.

Estimated difficulty: 2/5

*Rules*

Standard sudoku rules apply: every row, column, and box must contain a complete set of the digits 1-9.

Digits on thermometers must increase from bulb to tip.

Yes, we're back to modular lines! And still playing with hidden modular lines under different constraints. This puzzle also appears in Heartburn Collection 1.

Estimated difficulty: 3,5/5

*Rules*

Standard sudoku rules apply: every row, column, and box must contain a complete set of the digits 1-9.

Modular lines: every set of three sequential digits along a line must contain a complete set of residues modulo 3, i.e. one digit from {1,4,7}, one from {2,5,8}, and one from {3,6,9}. Digits may repeat on a line if allowed by other rules.

Sandwich sums: numbers outside the grid indicate the sum of all cells between 1 and 9 in that row or column, excluding 1 and 9 from the sum.

Every sandwich, including the crust, forms a hidden modular line. For example, a sandwich clue of 8 could be made of the three cells 189 but could not be 1269.

If you get stuck on the break-in to this puzzle, think about *the secret* and how you might use it multiple times. Zeroing In also appears in GAS Collection 2.

Estimated difficulty: 3.5/5

*Rules*

Normal sudoku rules apply: every row, column, and box must contain a complete set of the digits 1-9.

Killer cages: Inside cages marked by dashed lines, digits must sum to the number shown in the upper left corner of the cage.

Antiknight: Digits separated by a chess knight's move must be different.

This puzzle was set as an introduction to killer cages for those who may not have seen regular sudoku before. It can be solved entirely without any need for center- or cornermarks. It also appears in our Brassica Collection.

Estimated difficulty: Brassica

*Rules*

Normal sudoku rules apply: every row, column, and box must contain a complete set of the digits 1-9.

Inside cages marked by dashed lines, digits must sum to the number shown in the upper left corner of the cage.

Our first collaborative set with BremSter, this delightful puzzle was featured on Cracking the Cryptic on 22 October 2022. It also appears in the Heartburn Collection and as one of our Showcase Puzzles.

Estimated difficulty: 3.5/5

*Rules*

Normal sudoku rules apply: every row column and 3x3 box must contain a complete set of the digits 1 through 9.

Digits connected by an X sum to 10. Digits connected by a V sum to 5. Not all Xs or Vs are necessarily given.

Digits along a purple renban line form a set of non-repeating consecutive digits in any order.

Any set of three contiguous cells along a beige entropic line must contain one low digit (123), one medium digit (456), and one high digit (789).

The purest of knights gives the title for this puzzle, which also appears in Indigestion Collection 2.

Estimated difficulty: 2/5

*Rules*

Normal sudoku rules apply: every row column and 3x3 box must contain a complete set of the digits 1 through 9.

Normal anti-knight rules apply: cells separated by a chess knight's move cannot contain the same digit.

Despite the plethora of thermometers, this is a rather difficult puzzle requiring advanced solving techniques for the break-in. This puzzle also appears in Indigestion Collection 2.

Estimated difficulty: 2.5/5

*Rules*

Normal sudoku rules apply: every row column and 3x3 box must contain a complete set of the digits 1 through 9.

Normal killer cage rules apply: the digits in a cage cannot repeat and must sum to the number in the top left corner of the cage.

Normal anti-knight rules apply: cells separated by a chess knight's move cannot contain the same digit.

Despite the plethora of thermometers, this is a rather difficult puzzle requiring advanced solving techniques for the break-in. This puzzle also appears in the Heartburn Collection.

Estimated difficulty: 3.5/5

*Rules*

Normal sudoku rules: every row, column, and box must contain a complete set of the digits 1-9.

Digits on thermometers must increase from bulb to tip.

A straightforward killer cage puzzle, Waste Measurements also appears in our GAS Collection 2.

Estimated difficulty: 1/5

*Rules*

Normal 8x8 sudoku rules: every row, column, and box must contain a complete set of the digits 1-8.

Normal killer cages: digits within a cage cannot repeat and must sum to the number shown in the upper left.

Originally published as part of the CTC Fan Discord 8K Archive Puzzles Milestone Pack curated by BenceJoFul. It also appears in Indigestion Collection 2.

Estimated difficulty: 1.5/5

*Rules*

Normal 8x8 sudoku rules: every row, column, and box must contain a complete set of the digits 1-8.

Normal killer cages: digits within a cage cannot repeat and must sum to the number shown in the upper left (in this puzzle, always to 8).

Digits on thermometers must increase from bulb to tip.

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