NN555Rule is a focused logic game about observing relationships between geometric symbol cards.

Each challenge begins with a short chain of example cards. Study their outlines, mark counts, directions, and gap positions, then select the next card that keeps the relationship intact. The goal is not to match a picture. It is to explain how the visible attributes change from one card to the next.

Choose from three challenge levels:

Beginner introduces one clear change with a short chain. Standard weaves two visible attributes together and adds more decoys. Advanced asks you to follow a layered relationship through a longer chain.

Two mistakes are available in every challenge. If a choice breaks the pattern, the game identifies the kind of relationship that failed without giving away the answer. Use up to two optional hints: the first points your attention to a changing category, and the second removes one decoy. Undo a choice when you want to re-read the latest step.

Complete a chain to earn a result based on your mistakes, and keep your best result on the device. Challenges work offline, require no account, and store progress locally.