The small settlement lies at the origin of a 17-by-17-mile territory paved with lettered stone markers, with a river cutting a north-to-south path straight through the middle.
The local archivist hands you a set of translated explorer's notes. Some pages catch your eye:
...when we started our journey from the settlement, a brilliant beam of light projected from the lighthouse directly through us...
...the beam pierced the boundaries of the territory, wrapping flawlessly through the warped space until it struck exactly one other stable marker in the distance...
...but the point it struck was merely a phantom. To find the true next stable marker, we looked to the river. By reflecting the struck point straight across the river, the next stable marker was revealed...
...we step onto this new marker. The moment we pick up its letter, a new beam fires from the lighthouse through our current location, and a new reflection points us forward...
...we know the journey comes to an end when we see the lighthouse is exactly at the reflecting point across the river...
The notes end there, and the archivist hopes that you can help her discover the ultimate secret hidden in this landmass...
Use arrow keys or W, A, S, D to move.
Press space or click any cell to mark its stable status.