Moonsigil Atlas is a roguelike card game with no energy or turn limits, where cards are placed on the board like seals with shapes and effects. The focus is on placement and connections, not numbers. You can play cards in a row as long as there's room, and accelerate long chains if the board is built correctly and without unnecessary gaps. The board quickly becomes crowded, forcing you to think ahead. A card's shape dictates where it can be placed, and effects are triggered by its proximity and intersections.