The Wise One has dispatched benevolent Demigods to humanity's furthest corners. In OROS, each player takes on the role of a Demigod and must enlighten their Followers with mountain secrets through practice, adoration, and experience. Only at the mountains' peaks are the grandest enigmas revealed. OROS is a tile-shifting, volcano-erupting, mountain-raising, knowledge-amassing, action-economy strategy game. On individual mats, players move their Followers between action spaces, manipulating a shared environment similar to a colossal plate tectonics puzzle. Action spaces enable players to rearrange land rows, move and crash tiles, form and trigger volcanoes, worship for knowledge, venture their Followers around the constantly-changing terrain, and construct holy sites of study and veneration on mountains. Constructing holy sites and worshipping at them accrues knowledge, which enhances the faculties offered by each action space. Knowledge also boosts the end