SGT‐TENTS(6)

📦

version 20250730.a7c7826 · 4 versions

20250730.a7c7826 · ubuntu stonking (latest)
20191231.79a5378 · ubuntu jammy
20230122.806ae71 · debian bookworm
20230410.71cf891 · debian trixie, ubuntu noble, ubuntu questing, ubuntu resolute

🌸 NAME 🌸

sgt-tents — a Tent-placing puzzle 💖

yeah bestie, this is the sgt-tents(6) manual page, filed under Games, and it's literally one of the most delightful little logic grids out there. let's get into it ✨

✨ SYNOPSIS ✨

sgt-tents [--generate n] [--print wxh [--with-solutions] [--scale n]
[--colour]] [game-parameters|game-ID|random-seed]

sgt-tents --version

🎀 DESCRIPTION 🎀

okay so picture this: you've got a grid of squares, and some of them have trees in them 🌳. your whole job is to place tents in some of the other squares, and you've gotta do it so that all of the following are true:

There are exactly as many tents as trees. no more, no less, periodt.
The tents and trees can be matched up in such a way that each tent is directly adjacent (horizontally or vertically, but not diagonally) to its own tree. however — and this is the part that lowkey trips people up — a tent may be adjacent to other trees as well as its own 👀.
No two tents are adjacent horizontally, vertically or diagonally. tents are antisocial bestie, they need their space 💅.
The number of tents in each row, and in each column, matches the numbers given round the sides of the grid. those numbers are the vibe check, and you gotta pass it ✨.

This puzzle can be found in several places on the Internet, and was brought to my attention by e-mail. I don't know who I should credit for inventing it. (mystery inventor, we love you, whoever you are 🫶)

🎮 Tents controls 🎮

Left-clicking in a blank square will place a tent in it. 🏕️
Right-clicking in a blank square will colour it green, indicating that you are sure it isn't a tent 💚.
Clicking either button in an occupied square will clear it.

If you drag with the right button along a row or column, every blank square in the region you cover will be turned green, and no other squares will be affected. (this is so useful for clearing the remainder of a row once you have placed all its tents, fr fr 🧹)

You can also use the cursor keys to move around the grid:

Pressing the return key over an empty square will place a tent 🏕️
Pressing the space bar over an empty square will colour it green 💚
either key will clear an occupied square
Holding Shift and pressing the cursor keys will colour empty squares green
Holding Control and pressing the cursor keys will colour green both empty squares and squares with tents

(All the actions described below are also available.) 👑

🍓 Tents parameters 🍓

These parameters are available from the ‘Custom...’ option on the ‘Type’ menu.

Width, Height — Size of grid in squares.
Difficulty — Controls the difficulty of the generated puzzle. More difficult puzzles require more complex deductions, but at present none of the available difficulty levels requires guesswork or backtracking. (no guessing needed, we love a respectful puzzle 🫶)

🌈 Common actions 🌈

These actions are all available from the ‘Game’ menu and via keyboard shortcuts, in addition to any game-specific actions.

(On Mac OS X, to conform with local user interface standards, these actions are situated on the ‘File’ and ‘Edit’ menus instead.)

New game (N, Ctrl+N) — Starts a new game, with a random initial state. fresh start energy ✨
Restart game — Resets the current game to its initial state. (This can be undone — so if you restart by accident, bestie, you're fine 😌)
Load — Loads a saved game from a file on disk. 💾
Save — Saves the current state of your game to a file on disk.

The Load and Save operations preserve your entire game history (so you can save, reload, and still Undo and Redo things you had done before saving). literally time travel 💫

Print — Where supported (currently only on Windows), brings up a dialog allowing you to print an arbitrary number of puzzles randomly generated from the current parameters, optionally including the current puzzle. (Only for puzzles which make sense to print, of course – it's hard to think of a sensible printable representation of Fifteen! 😭)
Undo (U, Ctrl+Z, Ctrl+_, *) — Undoes a single move. (You can undo moves back to the start of the session. no shame in it, we've all been there 🙈)
Redo (R, Ctrl+R, #) — Redoes a previously undone move.
Copy — Copies the current state of your game to the clipboard in text format, so that you can paste it into (say) an e-mail client or a web message board if you're discussing the game with someone else. (Not all games support this feature.) 📋
Solve — Transforms the puzzle instantly into its solved state. For some games (Cube) this feature is not supported at all because it is of no particular use. For other games (such as Pattern), the solved state can be used to give you information, if you can't see how a solution can exist at all or you want to know where you made a mistake. For still other games (such as Sixteen), automatic solution tells you nothing about how to get to the solution, but it does provide a useful way to get there quickly so that you can experiment with set-piece moves and transformations.

Some games (such as Solo) are capable of solving a game ID you have typed in from elsewhere. Other games (such as Rectangles) cannot solve a game ID they didn't invent themself, but when they did invent the game ID they know what the solution is already. Still other games (Pattern) can solve some external game IDs, but only if they aren't too difficult.

The ‘Solve’ command adds the solved state to the end of the undo chain for the puzzle. In other words, if you want to go back to solving it yourself after seeing the answer, you can just press Undo. (spoil yourself, then un-spoil yourself. iconic behaviour 💅)

Quit (Q, Ctrl+Q) — Closes the application entirely. 👋
Preferences — Where supported, brings up a dialog allowing you to configure personal preferences about a particular game. Some of these preferences will be specific to a particular game; others will be common to all games.

One option common to all games allows you to turn off the one-key shortcuts like ‘N’ for new game or ‘Q’ for quit, so that there's less chance of hitting them by accident. You can still access the same shortcuts with the Ctrl key. 🛡️

🔑 Specifying games with the game ID 🔑

There are two ways to save a game specification out of a puzzle and recreate it later, or recreate it in somebody else's copy of the same puzzle.

The ‘Specific’ and ‘Random Seed’ options from the ‘Game’ menu (or the ‘File’ menu, on Mac OS X) each show a piece of text (a ‘game ID’) which is sufficient to reconstruct precisely the same game at a later date.

You can enter either of these pieces of text back into the program (via the same ‘Specific’ or ‘Random Seed’ menu options) at a later point, and it will recreate the same game. You can also use either one as a command line argument (on Windows or Unix); see below for more detail.

The difference between the two forms is that a descriptive game ID is a literal description of the initial state of the game, whereas a random seed is just a piece of arbitrary text which was provided as input to the random number generator used to create the puzzle. This means that:

Descriptive game IDs tend to be longer in many puzzles (although some, such as Cube (sgt-cube(6)), only need very short descriptions). So a random seed is often a quicker way to note down the puzzle you're currently playing, or to tell it to somebody else so they can play the same one as you.
Any text at all is a valid random seed. The automatically generated ones are fifteen-digit numbers, but anything will do; you can type in your full name, or a word you just made up, and a valid puzzle will be generated from it. This provides a way for two or more people to race to complete the same puzzle: you think of a random seed, then everybody types it in at the same time, and nobody has an advantage due to having seen the generated puzzle before anybody else. 🏁
It is often possible to convert puzzles from other sources (such as ‘nonograms’ or ‘sudoku’ from newspapers) into descriptive game IDs suitable for use with these programs.
Random seeds are not guaranteed to produce the same result if you use them with a different version of the puzzle program. This is because the generation algorithm might have been improved or modified in later versions of the code, and will therefore produce a different result when given the same sequence of random numbers. Use a descriptive game ID if you aren't sure that it will be used on the same version of the program as yours.

(Use the ‘About’ menu option to find out the version number of the program. Programs with the same version number running on different platforms should still be random-seed compatible.)

A descriptive game ID starts with a piece of text which encodes the parameters of the current game (such as grid size). Then there is a colon, and after that is the description of the game's initial state. A random seed starts with a similar string of parameters, but then it contains a hash sign followed by arbitrary data.

If you enter a descriptive game ID, the program will not be able to show you the random seed which generated it, since it wasn't generated from a random seed. If you enter a random seed, however, the program will be able to show you the descriptive game ID derived from that random seed. 🔄

Note that the game parameter strings are not always identical between the two forms. For some games, there will be parameter data provided with the random seed which is not included in the descriptive game ID. This is because that parameter information is only relevant when generating puzzle grids, and is not important when playing them. Thus, for example, the difficulty level in Solo (sgt-solo(6)) is not mentioned in the descriptive game ID.

These additional parameters are also not set permanently if you type in a game ID. For example, suppose you have Solo set to ‘Advanced’ difficulty level, and then a friend wants your help with a ‘Trivial’ puzzle; so the friend reads out a random seed specifying ‘Trivial’ difficulty, and you type it in. The program will generate you the same ‘Trivial’ grid which your friend was having trouble with, but once you have finished playing it, when you ask for a new game it will automatically go back to the ‘Advanced’ difficulty which it was previously set on. (it remembers its true self 🫶)

The ‘Type’ menu, if present, may contain a list of preset game settings. Selecting one of these will start a new random game with the parameters specified.

The ‘Type’ menu may also contain a ‘Custom’ option which allows you to fine-tune game parameters. The parameters available are specific to each game and are described in the following sections.

Specifying game parameters on the command line 💅

Heads up bestie: this section does not apply to the Mac OS X version.

Okay so listen. The games in this collection deliberately never, ever save anything onto the computer they're running on. No high score tables, no saved preferences, nothing. Zero. Nada. 🫥

Why, you ask? Because the author expects at least some people to be playing these at work, and those people will probably appreciate leaving as little evidence as possible 🙈✨ (we love a considerate king).

But — and here's the tea — if you do want one of these games to default to a particular set of parameters, you can just specify them on the command line. Easy.

The easiest way to do this: set up the parameters you want using the ‘Type’ menu (see above), and then select ‘Random Seed’ from the ‘Game’ or ‘File’ menu (see above too). The text sitting in the ‘Game ID’ box will be made of two parts, separated by a hash. The first of those parts represents the game parameters — think the size of the playing area, for example, and anything else you set using the ‘Type’ menu. 🎀

So if you run the game with just that parameter text on the command line, it'll start up with the settings you specified. Vibes matched. 💖

For example: if you run Cube (see sgt-cube(6)), select ‘Octahedron’ from the ‘Type’ menu, and then go to the game ID selection, you'll see a string of the form:

o2x2#338686542711620

Take only the part before the hash (o2x2), and start Cube with that text on the command line: sgt-cube o2x2. Slay. 👑

And if you copy the entire game ID onto the command line, the game will start up in the specific game that was described. Honestly this is occasionally a more convenient way to start a particular game ID than pasting it into the game ID selection box. iykyk. 🌈

(You could also retrieve the encoded game parameters using the ‘Specific’ menu option instead of ‘Random Seed’ — but if you do, then some options, like the difficulty level in Solo, will be missing. See above for more details on that. Don't say I didn't warn you. 💀)

Unix command-line options 🧚

This section only applies to the Unix port, bestie.

So on top of being able to specify game parameters on the command line (see above), there are various other options too. Let's get into them:

--game
--load — These two options respectively determine whether the command-line argument is treated as specifying game parameters, or as a save file to load. Only one should be specified. And if neither of these options is specified, a guess is made based on the format of the argument. Mystery mode. ✨
--generate n — If this option is specified, instead of a puzzle being displayed, a number of descriptive game IDs will be invented and printed on standard output. This is useful for gaining access to the game generation algorithms without necessarily using the frontend. 🎀

If game parameters are specified on the command-line, they will be used to generate the game IDs; otherwise a default set of parameters will be used.

The most common use of this option is in conjunction with --print, in which case its behaviour is slightly different; see below. 👀

--delete-prefs — This option causes the puzzle to delete the configuration file in which its user preferences were stored, if there is one. Clean slate era. 🫶
--print wxh — If this option is specified, instead of a puzzle being displayed, a printed representation of one or more unsolved puzzles is sent to standard output, in PostScript format. 📄

On each page of puzzles, there will be w across and h down. If there are more puzzles than w×*h*, more than one page will be printed.

If --generate has also been specified, the invented game IDs will be used to generate the printed output. Otherwise, a list of game IDs is expected on standard input (which can be descriptive or random seeds; see above), in the same format produced by --generate.

For example:

sgt-net --generate 12 --print 2x3 7x7w | lpr

will generate two pages of printed Net puzzles (each of which will have a 7×7 wrapping grid), and pipe the output to the lpr command, which on many systems will send them to an actual printer. Printer girlies rise up 🖨️✨

There are various other options which affect printing; see below.

--save file-prefix [ --save-suffix file-suffix ] — If this option is specified, instead of a puzzle being displayed, saved-game files for one or more unsolved puzzles are written to files constructed from the supplied prefix and/or suffix. 💾