Signal Shepherd is a synchronization puzzle across six lighthouse islands. A flock starts on every island at once. Each island has three outgoing rules, one for pulse A, one for B and one for C. Your broadcasts affect the entire flock simultaneously, wherever its members currently are.

Read the transition table before choosing a pulse. Each row identifies an island and lists where its flock will move for each of the three letters. Occupancy dots show the islands that currently contain flock members, while a star identifies the final goal island. When two groups reach the same island, they merge into one group.

The objective is to gather everyone on the single goal island. Reducing the number of occupied islands is useful, but the final location also matters. A pulse can move a merged group without splitting it again, allowing you to build a sequence that compresses the whole arrangement.

Fifty charts contain different transition tables and goal islands. Hint searches the finite space of occupied-island subsets and suggests the first pulse of a shortest remaining synchronization sequence. Undo reconstructs the flock by replaying its earlier pulse history without the latest broadcast. Recent letters remain visible above the table.

There is no time limit, hidden randomness during a chart or need to listen for a signal. This is a visual logic puzzle with gouache lighthouse artwork, a blue-green sea palette and clear letter controls.

YOUR CHALLENGE COLLECTION
All fifty challenges are available from Play. Choose any one, revisit a completed challenge or use Continue to open the last selected entry. Completion marks and settings are saved locally on the device. Continue starts that challenge from its initial arrangement; unfinished attempts are not restored. Restart asks before discarding the current attempt. After a successful challenge, you can advance to the next one or return to the collection.

CLEAR CONTROLS
The main menu contains exactly Play, Settings, How to Play and Exit. Each game has its own themed collection and working screen. Pause offers Resume, the challenge collection and the main menu. Hint explains a possible next action without applying it automatically. Undo follows the rules described above. The dedicated help screen explains the objective, controls and important conventions before you begin.

COMFORT AND OFFLINE PLAY
Settings let you disable decorative motion and choose a high-contrast interface background. Motion settings affect illustrations and applicable camera motion; they do not change the mathematical rules. High contrast removes the illustrated backdrop behind the controls. The interface is in English and combines text labels with visual indicators.

The game works offline without accounts, advertising, purchases, multiplayer or online leaderboards. Saved progress remains on the local device, with no cloud synchronization. You can work deliberately, inspect the current arrangement and return to earlier challenges whenever you want. The collection is finite and replayable, rather than an endless competitive service.