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Allure of the Stars is a near-future Sci-Fi roguelike and tactical squad combat game written in Haskell; please offer feedback, e.g., after trying out the web frontend version at



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Allure of the Stars

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Allure of the Stars is a near-future Sci-Fi roguelike2 and tactical squad combat game. Binaries and the game manual are available at the homepage6. You can also try the game out in the browser at

gameplay screenshot

Not a single image in this game. You have to imagine everything yourself, like with a book (a grown-up book, without pictures). Once you learn to imagine things, though, you can keep exploring and mastering the world and making up stories for a long time.

The game is written in Haskell1 using the LambdaHack10 roguelike game engine. Please see the changelog file for recent improvements and the issue tracker for short-term plans. Long term goals are high replayability and auto-balancing through procedural content generation and persistent content modification based on player behaviour. Contributions are welcome. Please offer feedback to or, preferably, on any of the public forums.

Game installation from binary archives

The game runs rather slowly in the browser (fastest on Chrome) and you are limited to the square font for all purposes, though it's scalable. Also, savefiles are prone to corruption on the browser, e.g., when it's closed while the game is still saving progress (which takes a long time). Hence, after trying out the game, you may prefer to use a native binary for your architecture, if it exists.

Pre-compiled game binaries are available through the release page11 (and Linux dev versions from GitHub Actions18 and Windows from AppVeyor19). To use a pre-compiled binary archive, unpack it and run the executable in the unpacked directory or use program shortcuts from the installer, if available. On Linux, make sure you have the SDL2 libraries installed on your system (e.g., libsdl2-2.0-0 and libsdl2-ttf-2.0-0 on Ubuntu). For Windows (XP no longer supported), the SDL2 and all other needed libraries are included in the game's binary archive.

Max OS X binaries for the few most popular OS versions are accessible from Homebrew via brew install allureofthestars, which also takes care of all dependencies.

Screen and keyboard configuration

The game UI can be configured via a config file. The default config settings, the same that are built into the binary, are on github at GameDefinition/config.ui.default. When the game is run for the first time, or whenever the config file is deleted, the file is written to the default user data location, which is ~/.Allure/ on Linux, C:\Users\<username>\AppData\Roaming\Allure\ (or C:\Documents And Settings\user\Application Data\Allure\ or something else altogether) on Windows and Inspect/Application/Local Storage under RMB menu when run inside the Chrome browser. If the user config file is outdated or corrupted, it's automatically moved away together with old savefiles. At the next game start, the new default config file appears at its place.

Screen fonts and, consequently, window size can be changed by editing the config file in the user data folder. The default bitmap font 16x16xw.bdf used for the game map covers most national characters in the Latin alphabet (e.g. to give custom names to player characters) and results in a game window of exactly 720p HD dimensions. The 8x8xb.fnt bitmap font results in a tiny window and covers latin-1 characters only. The config file parameter allFontsScale permits further window size adjustments, automatically switching to the scalable version of the large game map font (16x16xw.woff). Config file option chosenFontset governs not only the main game map font, but also the shape of the rectangular fonts, if any, in which longer texts are overlaid over the map.

For high resolution displays and/or if fullscreen mode is requested in the configuration file, allFontsScale needs to be set. E.g., scale 3 works for 4K displays. Otherwise, the letters may be too small or, in fullscreen or on retina displays in OS X, the screen may be automatically scaled as a whole, not each letter separately, softening letter edges of the square fonts that should rather be pixel-perfect and crisp.

If you don't have a numeric keypad, you can use the left-hand movement key setup (axwdqezc) or Vi editor keys (aka roguelike keys) or mouse. If numeric keypad doesn't work, toggling the Num Lock key sometimes helps. If running with the Shift key and keypad keys doesn't work, try the Control key instead. The game is fully playable with mouse only, as well as with keyboard only, but the most efficient combination may be mouse for menus, go-to, inspecting the map, aiming at distant positions and keyboard for everything else.

If you run the ANSI terminal frontend (--frontendANSI on commandline), then numeric keypad (especially keypad *, / and 5) may not work correctly, depending on the terminal emulator you use. Toggling the Num Lock key may help or make issues worse. As a work around these issues, numbers are used for movement in the ANSI frontend, which sadly prevents the number keys from selecting heroes. The commands that require pressing Control and Shift together won't work either, but fortunately they are not crucial to gameplay.

Some effort went into making the ANSI frontend usable with screen readers, but without feedback it's hard to say how accessible that setup is. This doesn't work on Windows, due to extra code that would be required. As a side effect of screen reader support, there is no aiming line nor path in ANSI frontend and some of map position highlighting is performed using the terminal cursor. Screen readers may also work better with animations turned off, using --noAnim or the corresponding config file or main game menu options.

Compiling native binary from source

To compile with the standard frontend based on SDL2, you need the SDL2 libraries for your OS. On Linux, remember to install the -dev versions as well, e.g., libsdl2-dev and libsdl2-ttf-dev on Ubuntu Linux 16.04. Compilation to JavaScript for the browser is more complicated and requires the ghcjs15 compiler and optionally the Google Closure Compiler16.

The latest official version of the game can be downloaded, compiled for SDL2 and installed automatically using the 'cabal' tool, which may already be a part of your OS distribution, but if it's too old (version 3.4 or later is required) you can download the whole current compilation suite as described at You can get and run the Allure of the Stars package from Hackage3 as follows

cabal update
cabal install Allure

For a newer, unofficial version, clone the game source from github5, clone a matching LambdaHack library snapshot into ../LambdaHack and run

cabal run --project-file=cabal.project.LH.dir

Alternatively, if you'd like to develop in this codebase, the following speeds up the turn-around a lot

cp cabal.project.local.development cabal.project.local

and then you can compile (and recompile) with

cabal build

and run the game with

make play

The SDL2 frontend binary also contains the ANSI terminal frontend (--frontendANSI on commandline) intended for screen readers and a simplified black and white line terminal frontend (--frontendTeletype) suitable for teletype terminals or a keyboard and a printer (but it's going to use a lot of paper, unless you disable animations with --noAnim). The teletype frontend is used in CI and for some tests and benchmarks defined in Makefile. The terminal frontends leave you on your own regarding font choice and color setup and you won't have the colorful squares outlining special positions that exist in the SDL2 frontend, but only crude cursor highlights. The terminal frontends should run on Windows, but Windows disables console for GUI applications, so they don't.

Testing and debugging

Integration tests can be run and displayed with

cabal test --test-show-details=direct

The Makefile contains many sample automated play test commands. Numerous tests that use the screensaver game modes (AI vs. AI) and the teletype frontend are gathered in make test-locally. Some of these are run by CI on each push to github. Test commands with prefix frontend start AI vs. AI games with the standard SDL2 frontend to view them on.

Run Allure --help to see a brief description of all debug options. Of these, the --sniff option is very useful (though verbose and initially cryptic), for displaying the traffic between clients and the server. Some options in the config file may prove useful for debugging too, though they mostly overlap with commandline options (and will be totally merged at some point).

Further information

For more information, visit the wiki4 and see, CREDITS and COPYLEFT.

For developer-focused information (coding style, overview of the codebase), please see the README of LambdaHack10.

Have fun!


Copyright (c) 2008--2011 Andres Loeh

Copyright (c) 2010--2021 Mikolaj Konarski and others (see git history)

Allure of the Stars is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License along with this program in file LICENSE. If not, see

Exceptions and detailed copyright information is contained in file COPYLEFT.