In Celestia, get ready for a cosmic adventure where the goal is simple, yet the strategy is deep: collect stars and form constellations to rule the universe. The game divides the deck into constellation cards and star cards. Initially, each player receives three star cards, and two constellation cards are revealed. During your turn, you draw one star card and have two options: either play two star cards face-down to challenge your opponents to match your cards, or discard a set of star cards that meet the requirements of a visible constellation. If you successfully form the constellation, you take it, earning the indicated points. Stars come in four types (alpha, beta, gamma, delta), and supernovae are wildcards, but always lose in matches. The game ends when the last constellation is collected. Scoring is done by totaling the points from the constellations you or your team (in 4-player games) have collected, with a 2-point bonus if you have three or more constellations of the same type. The player with the highest total score wins. It's a fast-paced and strategic game, perfect for those who enjoy a collection and bluffing challenge.