Have you wondered whether the hyperbolic geometry of HyperRogue does indeed affect gameplay, or is it just an irrelevant gimmick? In HyperRogue 5.3 you can find this out yourself! Euclidean mode is available on the third page of the Settings. The usual Achievements and Leaderboards cannot be obtained from the Euclidean mode, but there is one special Euclidean achievement. Euclidean mode has also led to a discovery of some subtleties... The first subtlety is that Mirages created by other Mirages work more correctly now. The second subtlety is that, in the previous versions, if you were attacked by two monsters at once and there were no obstacles nearby, you could easily run away and make them block each other. This was caused partly by the laws of the hyperbolic geometry, and partly by the weakness of the monster AI. In the new version, the monster AI has been improved a bit, so they actively try not to block each other, and thus it is now more important to learn how to use the geometry to your advantage. (Euclidean mode does not give any advantage to the chased, so if you are chased by two monsters, you have to run until you either find a third monster (which is usually game over), or a terrain obstacle which blocks one of them.) I am not sure whether this change affects the high scores, please tell me on the discussion forums if you think it does. Some minor fixes: end-game monsters no longer appear randomly in the Crossroads; the game now displays the remaining distance to the Key. Also, Steam trading cards for HyperRogue are now available! Have fun! Also see my blog for my own findings about the Euclidean mode.