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Welcome to the staging ground for new communities! Each proposal has a description in the "Descriptions" category and a body of questions and answers in "Incubator Q&A". You can ask questions (and get answers, we hope!) right away, and start new proposals.

Are you here to participate in a specific proposal? Click on the proposal tag (with the dark outline) to see only posts about that proposal and not all of the others that are in progress. Tags are at the bottom of each post.

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Meta What tags should these puzzles have?

The following posts in the Puzzles proposal have no tags other than the proposal tag. If we launch the community, those posts would be untagged. Can we get some tags for them? They're probably u...

7 answers  ·  posted 1d ago by Monica Cellio‭  ·  edited 12m ago by trichoplax‭

Question discussion puzzles
#4: Post edited by user avatar trichoplax‭ · 2026-09-18T12:17:17Z (12 minutes ago)
Remove Will's puzzles that now have tags added
  • The following posts in the [Puzzles](https://proposals.codidact.com/categories/68/tags/8367) proposal have no tags other than the proposal tag. If we launch the community, those posts would be untagged. Can we get some tags for them?
  • They're probably untagged because we're all guessing about what tags would be helpful. Some tags already in use are `grid-puzzles`, `tiling`, `calculation-puzzle`, `mathematics`, `riddle`, `logic-deduction`, and `geometry`. Are these the right tags? Are there missing tags? How should the following questions be tagged?
  • - [Place an X into seven of the squares](https://proposals.codidact.com/posts/296591)
  • - [Rearrange to make 5 fives](https://proposals.codidact.com/posts/296532)
  • - [Draw the boundaries of the eight dominoes](https://proposals.codidact.com/posts/296480)
  • - [Starting with 2014 "+" signs and 2015 "-" signs, you delete signs until one remains. What's left?](https://proposals.codidact.com/posts/296457)
  • - [What is the maximum number of Amazons that can be placed on a 5x5 chessboard so that no piece attacks another?](https://proposals.codidact.com/posts/296449)
  • - [Missing missing digit](https://proposals.codidact.com/posts/296394)
  • - [Packing a 3-dimensional object with 3-dimensional L-shaped pieces](https://proposals.codidact.com/posts/296033)
  • - [Delta and Epsilon play a game with marbles](https://proposals.codidact.com/posts/296186)
  • - [Alpha and Beta play a game with marbles](https://proposals.codidact.com/posts/296179)
  • - [Construct a cube and a pyramid](https://proposals.codidact.com/posts/295905)
  • - [What does the following represent?](https://proposals.codidact.com/posts/295907)
  • - [Connect the dots, A to A, B to B, C to C, and D to D](https://proposals.codidact.com/posts/295955)
  • - [Connect the dots, red to red, green to green and blue to blue](https://proposals.codidact.com/posts/295950)
  • - [Fill the circles so that consecutive numbers are not adjacent](https://proposals.codidact.com/posts/295931)
  • - [There is an intruder in our cat party!](https://proposals.codidact.com/posts/295926)
  • - [Subdividing a circle into 2 halves with equal numbers of letters A, B and C in each half](https://proposals.codidact.com/posts/295913)
  • - [Splitting a deck of cards into 2 piles](https://proposals.codidact.com/posts/295908)
  • - [Find the pattern in the fingers](https://proposals.codidact.com/posts/295903)
  • - [Can you make all the dominoes horizontal?](https://proposals.codidact.com/posts/295717)
  • - [Place 5 stones into 2 bags](https://proposals.codidact.com/posts/295694)
  • - [Walking 3 kilometres on a planet like Earth](https://proposals.codidact.com/posts/295665)
  • - [Can you transform 100 into CAT?](https://proposals.codidact.com/posts/295655)
  • - [Can you find the hidden stars?](https://proposals.codidact.com/posts/295631)
  • - [Place numbers around a circle to make all length 3 binary strings](https://proposals.codidact.com/posts/295556)
  • If some of these posts should get any of our existing tags, let's go ahead and edit them. (I just did that for one.) Discussion here can then focus on adding or changing the tags we have, like the answers posted already do.
  • The following posts in the [Puzzles](https://proposals.codidact.com/categories/68/tags/8367) proposal have no tags other than the proposal tag. If we launch the community, those posts would be untagged. Can we get some tags for them?
  • They're probably untagged because we're all guessing about what tags would be helpful. Some tags already in use are `grid-puzzles`, `tiling`, `calculation-puzzle`, `mathematics`, `riddle`, `logic-deduction`, and `geometry`. Are these the right tags? Are there missing tags? How should the following questions be tagged?
  • - [Missing missing digit](https://proposals.codidact.com/posts/296394)
  • If some of these posts should get any of our existing tags, let's go ahead and edit them. (I just did that for one.) Discussion here can then focus on adding or changing the tags we have, like the answers posted already do.
#3: Post edited by user avatar trichoplax‭ · 2026-09-18T11:48:10Z (41 minutes ago)
Remove my puzzles that I have now added tags to
  • The following posts in the [Puzzles](https://proposals.codidact.com/categories/68/tags/8367) proposal have no tags other than the proposal tag. If we launch the community, those posts would be untagged. Can we get some tags for them?
  • They're probably untagged because we're all guessing about what tags would be helpful. Some tags already in use are `grid-puzzles`, `tiling`, `calculation-puzzle`, `mathematics`, `riddle`, `logic-deduction`, and `geometry`. Are these the right tags? Are there missing tags? How should the following questions be tagged?
  • - [Place an X into seven of the squares](https://proposals.codidact.com/posts/296591)
  • - [Rearrange to make 5 fives](https://proposals.codidact.com/posts/296532)
  • - [Draw the boundaries of the eight dominoes](https://proposals.codidact.com/posts/296480)
  • - [Starting with 2014 "+" signs and 2015 "-" signs, you delete signs until one remains. What's left?](https://proposals.codidact.com/posts/296457)
  • - [What is the maximum number of Amazons that can be placed on a 5x5 chessboard so that no piece attacks another?](https://proposals.codidact.com/posts/296449)
  • - [Missing missing digit](https://proposals.codidact.com/posts/296394)
  • - [Letter shifting](https://proposals.codidact.com/posts/296397)
  • - [Packing a 3-dimensional object with 3-dimensional L-shaped pieces](https://proposals.codidact.com/posts/296033)
  • - [Delta and Epsilon play a game with marbles](https://proposals.codidact.com/posts/296186)
  • - [Alpha and Beta play a game with marbles](https://proposals.codidact.com/posts/296179)
  • - [Construct a cube and a pyramid](https://proposals.codidact.com/posts/295905)
  • - [What does the following represent?](https://proposals.codidact.com/posts/295907)
  • - [Connect the dots, A to A, B to B, C to C, and D to D](https://proposals.codidact.com/posts/295955)
  • - [A knight's sightseeing tour](https://proposals.codidact.com/posts/295788)
  • - [Connect the dots, red to red, green to green and blue to blue](https://proposals.codidact.com/posts/295950)
  • - [Fill the circles so that consecutive numbers are not adjacent](https://proposals.codidact.com/posts/295931)
  • - [There is an intruder in our cat party!](https://proposals.codidact.com/posts/295926)
  • - [Subdividing a circle into 2 halves with equal numbers of letters A, B and C in each half](https://proposals.codidact.com/posts/295913)
  • - [Splitting a deck of cards into 2 piles](https://proposals.codidact.com/posts/295908)
  • - [Find the pattern in the fingers](https://proposals.codidact.com/posts/295903)
  • - [Counter-intuitive triangle areas](https://proposals.codidact.com/posts/295830)
  • - [Can you make all the dominoes horizontal?](https://proposals.codidact.com/posts/295717)
  • - [Place 5 stones into 2 bags](https://proposals.codidact.com/posts/295694)
  • - [Walking 3 kilometres on a planet like Earth](https://proposals.codidact.com/posts/295665)
  • - [Can you transform 100 into CAT?](https://proposals.codidact.com/posts/295655)
  • - [Can you find the hidden stars?](https://proposals.codidact.com/posts/295631)
  • - [Place numbers around a circle to make all length 3 binary strings](https://proposals.codidact.com/posts/295556)
  • If some of these posts should get any of our existing tags, let's go ahead and edit them. (I just did that for one.) Discussion here can then focus on adding or changing the tags we have, like the answers posted already do.
  • The following posts in the [Puzzles](https://proposals.codidact.com/categories/68/tags/8367) proposal have no tags other than the proposal tag. If we launch the community, those posts would be untagged. Can we get some tags for them?
  • They're probably untagged because we're all guessing about what tags would be helpful. Some tags already in use are `grid-puzzles`, `tiling`, `calculation-puzzle`, `mathematics`, `riddle`, `logic-deduction`, and `geometry`. Are these the right tags? Are there missing tags? How should the following questions be tagged?
  • - [Place an X into seven of the squares](https://proposals.codidact.com/posts/296591)
  • - [Rearrange to make 5 fives](https://proposals.codidact.com/posts/296532)
  • - [Draw the boundaries of the eight dominoes](https://proposals.codidact.com/posts/296480)
  • - [Starting with 2014 "+" signs and 2015 "-" signs, you delete signs until one remains. What's left?](https://proposals.codidact.com/posts/296457)
  • - [What is the maximum number of Amazons that can be placed on a 5x5 chessboard so that no piece attacks another?](https://proposals.codidact.com/posts/296449)
  • - [Missing missing digit](https://proposals.codidact.com/posts/296394)
  • - [Packing a 3-dimensional object with 3-dimensional L-shaped pieces](https://proposals.codidact.com/posts/296033)
  • - [Delta and Epsilon play a game with marbles](https://proposals.codidact.com/posts/296186)
  • - [Alpha and Beta play a game with marbles](https://proposals.codidact.com/posts/296179)
  • - [Construct a cube and a pyramid](https://proposals.codidact.com/posts/295905)
  • - [What does the following represent?](https://proposals.codidact.com/posts/295907)
  • - [Connect the dots, A to A, B to B, C to C, and D to D](https://proposals.codidact.com/posts/295955)
  • - [Connect the dots, red to red, green to green and blue to blue](https://proposals.codidact.com/posts/295950)
  • - [Fill the circles so that consecutive numbers are not adjacent](https://proposals.codidact.com/posts/295931)
  • - [There is an intruder in our cat party!](https://proposals.codidact.com/posts/295926)
  • - [Subdividing a circle into 2 halves with equal numbers of letters A, B and C in each half](https://proposals.codidact.com/posts/295913)
  • - [Splitting a deck of cards into 2 piles](https://proposals.codidact.com/posts/295908)
  • - [Find the pattern in the fingers](https://proposals.codidact.com/posts/295903)
  • - [Can you make all the dominoes horizontal?](https://proposals.codidact.com/posts/295717)
  • - [Place 5 stones into 2 bags](https://proposals.codidact.com/posts/295694)
  • - [Walking 3 kilometres on a planet like Earth](https://proposals.codidact.com/posts/295665)
  • - [Can you transform 100 into CAT?](https://proposals.codidact.com/posts/295655)
  • - [Can you find the hidden stars?](https://proposals.codidact.com/posts/295631)
  • - [Place numbers around a circle to make all length 3 binary strings](https://proposals.codidact.com/posts/295556)
  • If some of these posts should get any of our existing tags, let's go ahead and edit them. (I just did that for one.) Discussion here can then focus on adding or changing the tags we have, like the answers posted already do.
#2: Post edited by user avatar Monica Cellio‭ · 2026-09-17T14:42:45Z (about 22 hours ago)
  • The following posts in the [Puzzles](https://proposals.codidact.com/categories/68/tags/8367) proposal have no tags other than the proposal tag. If we launch the community, those posts would be untagged. Can we get some tags for them?
  • They're probably untagged because we're all guessing about what tags would be helpful. Some tags already in use are `grid-puzzles`, `tiling`, `calculation-puzzle`, `mathematics`, `riddle`, `logic-deduction`, and `geometry`. Are these the right tags? Are there missing tags? How should the following questions be tagged?
  • - [Place an X into seven of the squares](https://proposals.codidact.com/posts/296591)
  • - [Rearrange to make 5 fives](https://proposals.codidact.com/posts/296532)
  • - [Draw the boundaries of the eight dominoes](https://proposals.codidact.com/posts/296480)
  • - [Starting with 2014 "+" signs and 2015 "-" signs, you delete signs until one remains. What's left?](https://proposals.codidact.com/posts/296457)
  • - [What is the maximum number of Amazons that can be placed on a 5x5 chessboard so that no piece attacks another?](https://proposals.codidact.com/posts/296449)
  • - [Missing missing digit](https://proposals.codidact.com/posts/296394)
  • - [Letter shifting](https://proposals.codidact.com/posts/296397)
  • - [Packing a 3-dimensional object with 3-dimensional L-shaped pieces](https://proposals.codidact.com/posts/296033)
  • - [Delta and Epsilon play a game with marbles](https://proposals.codidact.com/posts/296186)
  • - [Alpha and Beta play a game with marbles](https://proposals.codidact.com/posts/296179)
  • - [Construct a cube and a pyramid](https://proposals.codidact.com/posts/295905)
  • - [What does the following represent?](https://proposals.codidact.com/posts/295907)
  • - [Connect the dots, A to A, B to B, C to C, and D to D](https://proposals.codidact.com/posts/295955)
  • - [A knight's sightseeing tour](https://proposals.codidact.com/posts/295788)
  • - [Connect the dots, red to red, green to green and blue to blue](https://proposals.codidact.com/posts/295950)
  • - [Fill the circles so that consecutive numbers are not adjacent](https://proposals.codidact.com/posts/295931)
  • - [There is an intruder in our cat party!](https://proposals.codidact.com/posts/295926)
  • - [Subdividing a circle into 2 halves with equal numbers of letters A, B and C in each half](https://proposals.codidact.com/posts/295913)
  • - [Can the blind woman determine the color of the hat on her head?](https://proposals.codidact.com/posts/295909)
  • - [Splitting a deck of cards into 2 piles](https://proposals.codidact.com/posts/295908)
  • - [Find the pattern in the fingers](https://proposals.codidact.com/posts/295903)
  • - [Counter-intuitive triangle areas](https://proposals.codidact.com/posts/295830)
  • - [Can you make all the dominoes horizontal?](https://proposals.codidact.com/posts/295717)
  • - [Place 5 stones into 2 bags](https://proposals.codidact.com/posts/295694)
  • - [Walking 3 kilometres on a planet like Earth](https://proposals.codidact.com/posts/295665)
  • - [Can you transform 100 into CAT?](https://proposals.codidact.com/posts/295655)
  • - [Can you find the hidden stars?](https://proposals.codidact.com/posts/295631)
  • - [Place numbers around a circle to make all length 3 binary strings](https://proposals.codidact.com/posts/295556)
  • The following posts in the [Puzzles](https://proposals.codidact.com/categories/68/tags/8367) proposal have no tags other than the proposal tag. If we launch the community, those posts would be untagged. Can we get some tags for them?
  • They're probably untagged because we're all guessing about what tags would be helpful. Some tags already in use are `grid-puzzles`, `tiling`, `calculation-puzzle`, `mathematics`, `riddle`, `logic-deduction`, and `geometry`. Are these the right tags? Are there missing tags? How should the following questions be tagged?
  • - [Place an X into seven of the squares](https://proposals.codidact.com/posts/296591)
  • - [Rearrange to make 5 fives](https://proposals.codidact.com/posts/296532)
  • - [Draw the boundaries of the eight dominoes](https://proposals.codidact.com/posts/296480)
  • - [Starting with 2014 "+" signs and 2015 "-" signs, you delete signs until one remains. What's left?](https://proposals.codidact.com/posts/296457)
  • - [What is the maximum number of Amazons that can be placed on a 5x5 chessboard so that no piece attacks another?](https://proposals.codidact.com/posts/296449)
  • - [Missing missing digit](https://proposals.codidact.com/posts/296394)
  • - [Letter shifting](https://proposals.codidact.com/posts/296397)
  • - [Packing a 3-dimensional object with 3-dimensional L-shaped pieces](https://proposals.codidact.com/posts/296033)
  • - [Delta and Epsilon play a game with marbles](https://proposals.codidact.com/posts/296186)
  • - [Alpha and Beta play a game with marbles](https://proposals.codidact.com/posts/296179)
  • - [Construct a cube and a pyramid](https://proposals.codidact.com/posts/295905)
  • - [What does the following represent?](https://proposals.codidact.com/posts/295907)
  • - [Connect the dots, A to A, B to B, C to C, and D to D](https://proposals.codidact.com/posts/295955)
  • - [A knight's sightseeing tour](https://proposals.codidact.com/posts/295788)
  • - [Connect the dots, red to red, green to green and blue to blue](https://proposals.codidact.com/posts/295950)
  • - [Fill the circles so that consecutive numbers are not adjacent](https://proposals.codidact.com/posts/295931)
  • - [There is an intruder in our cat party!](https://proposals.codidact.com/posts/295926)
  • - [Subdividing a circle into 2 halves with equal numbers of letters A, B and C in each half](https://proposals.codidact.com/posts/295913)
  • - [Splitting a deck of cards into 2 piles](https://proposals.codidact.com/posts/295908)
  • - [Find the pattern in the fingers](https://proposals.codidact.com/posts/295903)
  • - [Counter-intuitive triangle areas](https://proposals.codidact.com/posts/295830)
  • - [Can you make all the dominoes horizontal?](https://proposals.codidact.com/posts/295717)
  • - [Place 5 stones into 2 bags](https://proposals.codidact.com/posts/295694)
  • - [Walking 3 kilometres on a planet like Earth](https://proposals.codidact.com/posts/295665)
  • - [Can you transform 100 into CAT?](https://proposals.codidact.com/posts/295655)
  • - [Can you find the hidden stars?](https://proposals.codidact.com/posts/295631)
  • - [Place numbers around a circle to make all length 3 binary strings](https://proposals.codidact.com/posts/295556)
  • If some of these posts should get any of our existing tags, let's go ahead and edit them. (I just did that for one.) Discussion here can then focus on adding or changing the tags we have, like the answers posted already do.
#1: Initial revision by user avatar Monica Cellio‭ · 2026-09-17T03:30:16Z (1 day ago) 
What tags should these puzzles have?
The following posts in the [Puzzles](https://proposals.codidact.com/categories/68/tags/8367) proposal have no tags other than the proposal tag.  If we launch the community, those posts would be untagged.  Can we get some tags for them?

They're probably untagged because we're all guessing about what tags would be helpful.  Some tags already in use are `grid-puzzles`, `tiling`, `calculation-puzzle`, `mathematics`, `riddle`, `logic-deduction`, and `geometry`.  Are these the right tags?  Are there missing tags?  How should the following questions be tagged?

- [Place an X into seven of the squares](https://proposals.codidact.com/posts/296591)

- [Rearrange to make 5 fives](https://proposals.codidact.com/posts/296532)

- [Draw the boundaries of the eight dominoes](https://proposals.codidact.com/posts/296480)

- [Starting with 2014 "+" signs and 2015 "-" signs, you delete signs until one remains. What's left?](https://proposals.codidact.com/posts/296457)

- [What is the maximum number of Amazons that can be placed on a 5x5 chessboard so that no piece attacks another?](https://proposals.codidact.com/posts/296449)

- [Missing missing digit](https://proposals.codidact.com/posts/296394)

- [Letter shifting](https://proposals.codidact.com/posts/296397)

- [Packing a 3-dimensional object with 3-dimensional L-shaped pieces](https://proposals.codidact.com/posts/296033)

- [Delta and Epsilon play a game with marbles](https://proposals.codidact.com/posts/296186)

- [Alpha and Beta play a game with marbles](https://proposals.codidact.com/posts/296179)

- [Construct a cube and a pyramid](https://proposals.codidact.com/posts/295905)

- [What does the following represent?](https://proposals.codidact.com/posts/295907)

- [Connect the dots, A to A, B to B, C to C, and D to D](https://proposals.codidact.com/posts/295955)

- [A knight's sightseeing tour](https://proposals.codidact.com/posts/295788)

- [Connect the dots, red to red, green to green and blue to blue](https://proposals.codidact.com/posts/295950)

- [Fill the circles so that consecutive numbers are not adjacent](https://proposals.codidact.com/posts/295931)

- [There is an intruder in our cat party!](https://proposals.codidact.com/posts/295926)

- [Subdividing a circle into 2 halves with equal numbers of letters A, B and C in each half](https://proposals.codidact.com/posts/295913)

- [Can the blind woman determine the color of the hat on her head?](https://proposals.codidact.com/posts/295909)

- [Splitting a deck of cards into 2 piles](https://proposals.codidact.com/posts/295908)

- [Find the pattern in the fingers](https://proposals.codidact.com/posts/295903)

- [Counter-intuitive triangle areas](https://proposals.codidact.com/posts/295830)

- [Can you make all the dominoes horizontal?](https://proposals.codidact.com/posts/295717)

- [Place 5 stones into 2 bags](https://proposals.codidact.com/posts/295694)

- [Walking 3 kilometres on a planet like Earth](https://proposals.codidact.com/posts/295665)

- [Can you transform 100 into CAT?](https://proposals.codidact.com/posts/295655)

- [Can you find the hidden stars?](https://proposals.codidact.com/posts/295631)

- [Place numbers around a circle to make all length 3 binary strings](https://proposals.codidact.com/posts/295556)
discussion puzzles