Inis is a strategically sophisticated game grounded in Celtic mythology and historical traditions, wherein players achieve victory through election as King of the Island (Inis). Players may pursue one of three distinct victory conditions:

Leadership: Establish dominance—specifically, maintain a greater number of clan figures than any competing player—across territories containing a minimum of six opposing clans.
Land: Establish clan presence across at least six separate territories.
Religion: Establish clan presence in territories that collectively encompass at least six sanctuaries.

During each round's commencement, players engage in a drafting process to acquire four action cards during the Assembly phase. Action cards that remain unplayed upon season conclusion are forfeited and cannot be retained for subsequent rounds. Players additionally gain access to leader cards corresponding to territories where they achieved elected leadership status during the assembly. Each Assembly session redistributes these cards accordingly. Furthermore, players accumulate "epic tales" cards representing the accomplishments of ancient Irish deities and legendary figures, including Cuchulainn, the Dagda, Lugh, and numerous others. These cards are retained and deployed to motivate clans and accomplish extraordinary objectives under appropriate conditions. The card collection encompasses diverse actions: clan recruitment, clan relocation, construction and exploration, and specialized actions. Throughout gameplay, players accumulate deeds that reduce by one the cumulative requirement for any Victory condition.

Strategic card selection, effective hand management, tactical deception (particularly once players recognize the significance of turn passing), optimal timing, and sophisticated comprehension of power dynamics constitute the fundamental elements of successful gameplay. Following an introductory game, participants will be adequately prepared for a comprehensive and grand competition, wherein a preeminent player will attain kingship through the Assembly by virtue of demonstrated merit and strategic acumen.

Despite featuring "units" positioned "on a map," treating Inis as a combat-focused game represents a fundamental strategic error, as the elimination of opposing clans diminishes your prospects for achieving a Leadership victory condition. Peaceful coexistence among distinct clans, whether or not a definitive territorial leader emerges, constitutes the typical outcome of clan movement. Conflict will inevitably arise, naturally, as the Celtic clans demonstrate