Update Notes for HyperRogue 13.1l
Game: - after 3 illegal moves, provide some suggestions regarding possible skip-moves and Orb uses - Ivy can now grow through single-tile wide chasms - fixed Vine Spirits sometimes considering some halfvine-related moves illegal - no more parrots placed near the player after usin
Game:
- after 3 illegal moves, provide some suggestions regarding possible skip-moves and Orb uses
- Ivy can now grow through single-tile wide chasms
- fixed Vine Spirits sometimes considering some halfvine-related moves illegal
- no more parrots placed near the player after using Orb of Safety
- going back towards the Orb of Yendor now keeps the timer ghosts away
- replaced "it is a shame to cheat" with a less judgemental "cheaters never win"
Features:
- compass-and-ruler functionality in the drawing tool (and other graphics tools)
- more intuitive dragging on touchscreens (controlled by the `drag_sensitivity` setting)
Bugfixes:
- female Rogue can now change her dress
- reset-special-modes now also resets texture mode and drawplayer off
- fixed some shmup crashes
- in "local scores", fixed dragging, and doubly-displayed time
- disabling yendor/tactics now correctly sets the land to Ice
- pressing yendor/tactic mode in the menu now, when active, automatically disables the mode
- less CPU usage when out of focus
Experiment with geometry:
- in 'arbitrary file' and Archimedean tilings, the "strict tree maps" system is now used by default for hyperbolic tilings. This allows more complex land generation (horocycles) and
avoids precision errors. In case of any problems, the 'auto_rulegen' setting can be switched off. If switched off, the 'backed' system is reimplemented, and options to study the
precision issues are added to the 'experiment with geometry' menu.
- fixed the distance computation in bitruncated {4,5}
- field patterns (Blizzard, Wasteland) now work correctly in Goldberg/unrectified/untruncated geometries
- fixed missing generation in some lands in some geometries
- fixed Hunting Ground in quickly expanding geometries
- fixed dice generated immobile in some geometries such as {5,4} bitruncated
- fixed a crash when displaying a compass in binary tiling
- disabled more patterned lands in 'strict tree maps'
- provided an alternate unlock for Burial Grounds
- zebra patterns: binary-tiling (parity), oox3 (random)
Have fun!
Original post 
Nevertheless, there have been a lot of small updates and bugfixes since 13.0. For people who have not been following HyperRogue closely, here are some larger features:
list
* In classic roguelikes, the highscore list mentioned how you died, so you could look at your highscore and see what tends to kill you. These death reasons were often amusing, and in roguelikes such as ADOM players even used to collect death reasons. This was harder to achieve in HyperRogue, where you usually do not die because of a hit by a single enemy, but rather, you are checkmated by multiple enemies. But this is fixed now! You get a story describing the checkmate, such as icaptured by Icewolf and Yeti while blocked by ice wall,/i or icaptured by Sand Worm while blocked by sand dune/i.
* New land structures! In addition to the standard separation by "great walls", and classic alternative options such as the "chaos mode", and recently introduced "horodisk" or "ideal Voronoi" modes, we can also play on a land network based on Crossroads II, Crossroads IV, and the new Crossroads VI.
* Some new tilings and honeycombs to play in, such as the tetrahedral-octahedral honeycomb, or a hex-based honeycomb in Nil geometry. Additionally, the shapes of tiles in Goldberg-Coxeter tilings have been improved, and the style can be changed based on several possible rules.
* HyperRogue lets you do lots of things to change the basic workings of the game. For example, as mentioned above, you can change the geometry and tiling to mostly whatever you want; the game tries it best to work in the given tiling -- by adapting some lands, and disabling those which it thinks would not work well. However, it is still possible that some lands are not correctly balanced, disabled even though you like them, or not disabled when they do not work. Hence, we added a new mode which allow you to customize your game, by picking a list of lands, and also possibly rebalancing their monster and treasure frequency. Additionally, there is a custom mode manager, which lets you see the modes you have played in, and play them again, or save them to files to share with other people!
* The game has been translated to Chinese!
/list
And, as usual, lots of other minor improvements and bugfixes, about which you can read in the detailed changelog. Have fun!
HyperRogue 13.0 includes an option to play the game with another weapon: a crossbow instead of the classic blade! A classic traditional roguelike strategy is: when attacked by an overwhelming force of multiple enemies, move into a corridor, forcing them to attack one by one; HyperRogue combines this idea with hyperbolic geometry, making this strategy work even in open space, due to the geometry of the world itself. But why use your blade to attack them one by one, when you could also have a penetrating attack that kills the whole straight line of enemies in a single shot? As a counterbalance, the crossbow takes several turns to reload.
Rethinking the concept of a straight line was fundamental for the development of non-Euclidean geometries; in HyperRogue, it becomes even more sophisticated, because this geometric concept needs to be interpreted in terms of grid tactics. Some roguelikes let you fire your ranged attack at any point, while in some, they work a bit like a Queen in chess: ranged attacks can be aimed only cardinally or diagonally. And in some, it depends on the type of ranged attack used. So, the crossbow could actually be a few different weapons. A crossbow which shoots only in "bull lines" is less universal than one that can shoot along any tile-based approximation of a hyperbolic straight line, but it takes less time to reload. There is also a third option, but we will just let you see for yourself.
Probably the most popular mathematical discovery of 2023 was the discovery of 
While the rules of HyperRogue are specially designed for hyperbolic geometry, you can e.g. play the Minefield land in the Hat/Spectre tiling, to get a more original variation on Minesweeper. There are more options to customize the geometry of the world -- for example, the 
If you do not want to change the geometry of the world, you can still change how it is structured... New options shown in the images above replace the usual HyperRogue land structure (lands separated mostly by hyperbolic straight lines) with alternative ones. In one, every land is bounded by a horocycle (a shape existing only in non-Euclidean geometry that looks a bit like a circle but is actually infinite)...
In another, the hyperbolic plane is subdivided into lands like in a Voronoi tessellation -- some points are chosen as centers, every tile gets assigned to a land depending on which center is closest to it -- but where the centers are very rare... 
Is HyperRogue the only game where tessellations of non-Euclidean spaces play a major role? Well, no -- while the wonders of hyperbolic tessellations are rarely used, spherical tessellations can be found in any game using dice! When you roll a die and see how the numbers change, interesting things happen as a result of the difference in the geometries of the die and the surface. Many HyperRogue players are dice collectors. Why not have both?
Meet the sentient dice in the Dice Reserve! They like to be in the position where the highest number is on top, but some bad guys rolled some of them into other positions. Will you help them?
Dice Reserve can be found when you have at least 90 (150 in Orb Strategy Mode) treasure.
Every land in HyperRogue comes with a new Orb -- a sphere of beneficial magical power. The Cursed Canyon is a land full of Curses. Curses are similar to Orbs, but their powers are mostly negative. You may get weaker, slower, powerless, or afraid of water. You get cursed by moving over curses, or when attacked by a Canyon Hag. You are also pursued by the Shadow, already known from the Graveyard. Will you be able to survive and profit despite all the debuffs and nasty enemies?
Cursed Canyon can be found when you have at least 36 (90 in Orb Strategy Mode) Elixirs of Life, Pirate Treasures, Chrysoberyls, Tiger's Eyes, or Powerstones.
[previewyoutube=6Mx1G0RlYck;full][/previewyoutube]
When HyperRogue was first released, it had only the traditional-style roguelike "graphics": # for walls, letters for monsters, dots for empty spaces. These visuals were truly amazing: easy to read, and let your imagination run wild, better than any graphics. But art is needed to, to feed the imagination. How would a non-Euclidean space really look? HyperRogue took a rather surprising path, starting with vector-based 2D graphics, then 3D effects, experiments with full 3D geometries, ultimately becoming a rather universal engine for non-Euclidean visualization.
Now, the RogueViz engine supports Virtual Reality (SteamVR)! This brings a new twist to HyperRogue, as well as the non-Euclidean falling block game Bringris and the RogueViz demos. Turn HyperRogue's FPP mode into the immersive experience. There are many interesting choices when designing non-Euclidean VR visualizations. The geometry works differently in a non-Euclidean space, so some obvious things in Euclidean visualizations (including tons of so-called "non-Euclidean" videos which have nothing to do with non-Euclidean geometry) are, well, no longer obvious. Should the relative headset movements be translated exactly to the virtual space? If so, if you move to another place in VR and return to where you started, you are probably NOT in the place where you started in the real world. And vice versa. This is because the geometry works differently! How should the binocular vision work? Should we just render the inner view from two points? If so, distances are not perceived correctly, and in the recently introduced even weirder geometries this does not even work, so we might want to use other methods. The engine lets you configure various details, such as the above, the length of the absolute unit (i.e. the scale of the non-Euclidean space), and so on. Hyperbolic crochets are much better in real life than any images or videos can show -- but you can get some of the fun by playing HyperRogue on the Hypersian Rug in VR. The 3D models are still not great (roguelike players do not need this stuff), but if you want to play FPP mode with monsters shown as letters, or view the classic Poincaré disk or any other 2D or 3D model in VR, this works too, of course!
There is more!
There have been also lots of minor bugfixes and improvements. For people who want to fully explore the world of HyperRogue but are less familiar with roguelikes, there is a "casual" mode which lets you save the game after collecting an Orb of Safety and load it many times. For even less challenge, there is the cheat mode and puzzle/exploration mode as usual.
Join the HyperRogue Discord, follow ZenoRogue on Twitter, and have fun!