ROR meaning in Computing ?

Risk of Rain is a 2013 platform video game incorporating Metroidvania and roguelike elements, developed by a two-student team from the University of Washington under the name Hopoo Games. The game, initially a student project, was funded through a Kickstarter campaign to improve the title, and was published by Chucklefish to Microsoft Windows in November 2013. OS X and Linux versions premiered as part of a Humble Bundle on October 28, 2014. Ports for the PlayStation 4 and PlayStation Vita, developed with assistance from Code Mystics, were released on April 12, 2016. A Nintendo Switch version was released on September 19, 2018 and an Xbox One version was released on August 30, 2019.

The player controls the survivor of a space freighter crash on a strange planet. As the player progresses through levels, selected randomly and with some procedural placement of objects within the level, they attempt to survive by killing monsters and collecting items that can boost their offensive and defensive abilities. The game features a difficulty scale that increases with time, requiring the player to choose between spending time building experience and completing levels quickly before the monsters become more difficult. By discovering various hidden locations, players can discover artifacts which can alter gameplay. The game supports up to ten cooperative players in online play and up to two players in local play.

A sequel, Risk of Rain 2, was released in August 2020, which included a jump from 2D to 3D.