This puzzle was set in celebration of Missing's 61st birthday. It also appears in Indigestion Collection 1 and the Special Themes Collection.

Estimated difficulty: 2.5/5

*Rules*

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

Standard killer cages: Digits in a cage indicated by a dashed line cannot repeat and must sum to the total shown in the upper left corner of the cage.

Standard whispers lines: Digits along green lines must differ by at least 5 and can repeat if allowed by other rules.

Standard renban lines: Digits along purple lines form a non-repeating set of consecutive digits that can appear in any order along the line.

Standard Kropki dots: Digits separated by a white dot differ by the amount shown in the dot. If no value is given in the dot, the digits differ by 1 (are consecutive). No negative constraint applies.

This puzzle is one of the few solo sets in our collection. FullDeck set it as a birthday gift to Missing a Few Cards. It also appears in Indigestion Collection 1 and the Special Themes Collection.

Estimated difficulty: 2.5/5

*Rules*

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

Standard killer cages: Digits in a cage indicated by a dashed line cannot repeat and must sum to the total shown in the upper left corner of the cage.

Standard whispers lines: Digits along green lines must differ by at least 5 and can repeat if allowed by other rules.

Standard renban lines: Digits along purple lines form a non-repeating set of consecutive digits that can appear in any order along the line.

Standard Kropki dots: Digits separated by a white dot differ by the amount shown in the dot. If no value is given in the dot, the digits differ by 1 (are consecutive). No negative constraint applies.

Solve in the CTC app (with decorative elements)

Solve in the CTC app (no decorative elements)

This puzzle uses the modular entropic lines constraint introduced in Modular Lines 1 but is a bit harder and can also be found in Indigestion Collection 1.

Estimated difficulty: 3.5/5

*Rules*

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

Standard killer cages: Digits in a cage indicated by a dashed line cannot repeat and must sum to the total shown in the upper left corner of the cage.

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 on two-cell lines cannot be from the same residue set. Digits may repeat on a line if allowed by other rules.

This puzzle introduces a new constraint inspired by the entropic lines constraint created by Riffclown, JC Godart, Raumplaner, JeremyDover, and other setters in the Skunkworks Collective. Since it introduces a new constraint, this puzzle is intended to be fairly straightforward, but is still in Indigestion Collection 1.

Estimated difficulty: 3/5

*Rules*

Modular Lines**:** Every set of three adjacent digits on a line must contain a complete set of residues modulo 3. That is, for any set of three adjacent digits on the line, if you divide each by 3, one will have a remainder of 0, one will have a remainder of 1, and one will have a remainder of 2. Digits may repeat along the line if allowed by other rules.

Example: 579219 would be a legal sequence of digits along the line provided the 9's don't see each other in the row, column, or box. This is legal since the remainders form the sequence 210210 and any string of 3 digits in the remainder contains all three possible values.

Another way of thinking of this is that digits along the line are grouped into three sets: {147}, {258}, {369}. .

This puzzle is also part of the Brassica Collection and is a Website Exclusive.

Estimated difficulty: 1/5

*Rules*

Killer cages: Digits within cages marked by dashed lines cannot repeat within the cage and must sum to the number in the upper left corner of the cage.

XV: Digits separated by an "X" sum to 10. Digits separated by a "V" sum to 5.

This puzzle is also part of the GAS Collection and is a Website Exclusive.

Estimated difficulty: 1.5/5

*Rules*

Thermometers: Digits on a thermometer must increase from the bulb end to the tip. Digits on the thermometer do not have to be consecutive.

This puzzle is also part of the Brassica Collection and is a Website Exclusive.

Estimated difficulty: 1/5

*Rules*

Killer cages: Digits in cages indicated by dashed lines cannot repeat and must sum to the number shown in the upper left corner of the cage.

This puzzle was inspired by the children's game of pick-up jacks. If you're too young to remember the exquisite pain of jacks left scattered on the floor, google it. Or just imagine Legos made of metal that *always* fall with a spike pointing up. Fun times!

Estimated difficulty: 2.5/5

*Rules*

Thermos: Digits on thermometers must increase from bulb to tip but do not have to be consecutive.

Killer cages: Digits in cages indicated by dashed lines cannot repeat and must sum to the number shown in the upper left corner of the cage.

As the whole world watches in horror the events in Ukraine, we made this puzzle as a small voice of support. The given digits in the grid are in honor of the Ukrainian independence day, August 24.

Estimated difficulty: 3/5

*Rules*

Normal Sudoku rules apply: Each row, column, and 3x3 box contains each number from 1 to 9 exactly once.

Blue of the Ukraine flag: Ukraine whispers line (known as German whispers in other circumstances: adjacent digits must differ by at least 5).

Yellow of the Ukraine flag: Ukraine pairs (digits on the line are consecutive).

Kropki dots: digits separated by a black dot are in a 1:2 ratio.

Spring Break hit and our solving juices got flowing! Lockout Lines was set in an attempt to better understand this constraint and it turned into a lovely little puzzle. It also appears in Indigestion Collection 1.

Estimated difficulty: 3/5

*Rules*

Lockout lines: Digits in the diamonds at the ends of a lockout line must differ by at least 4. Digits on the line may repeat but cannot be equal to or between the digits in the diamonds.

Kropki dots: Digits on either side of a white dot are consecutive. Not all possible dots are shown.

This puzzle came out of pondering how SET and disjoint groups might interact. Although it doesn't make use of SET, it's a fun puzzle. It has a unique solution without the kropki dots, but it's a painful slog with a lot of bifurcation to get there. The kropki dots make it a smooth solve and on the easier side, although definitely not a GAS puzzle. DisArray also appears in Indigestion Collection 1 and in the Showcase. This puzzle was featured on Cracking the Cryptic on 29 March 2022.

Estimated difficulty: 2/5

*Rules*

Standard arrow constraint: digits along an arrow must sum to the number shown in the attached circle and can repeat if allowed by other constraints.

Standard killer cage constraint: digits within a cage marked by a dashed border cannot repeat and must sum to the total shown in the upper left corner of the cage.

Standard kropki difference dot constraint: digits on either side of a white dot are consecutive. No negative constraint applies.

Standard disjoint groups constraint: Digits in the same relative position within boxes must be different.

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