Green Heights is a hardcore vertical climb simulator that emphasizes precise movement under limited visibility. The game's atmosphere is permeated with a sense of oppressive unease, borne of a distinctive visual style with deliberately primitive textures and poor lighting. The environment resembles a giant terrarium, overgrown with dense vegetation, through which the trajectory to the top of a mysterious tower winds. The gameplay demands maximum concentration, as a single misstep results in a prolonged fall and the loss of accumulated progress. Overcoming challenging terrain is made easier by responsive controls and the ability to utilize.