Lightning talk at wroclove.rb 2023 prepared as a response to Pavo's opening game talk. Speaker wanted to write a game without Rails and found a nice roguelike framework — written in Kotlin. Uses JRuby to call the Kotlin/Java libraries from Ruby. Demo game 'Game Hunter': a character walks around a cave looking for blue gems, can place bombs to destroy walls, and dies in fire (revealing a familiar Ruby stack trace). Code uses an entity-component-system architecture wrapped around the Kotlin/Java libraries. QR code links to the repository for cloning.