Puzzle 3

Puzzle 3 is one of the mysteries in Islands of Insight.
==Hints==
*A promenade denotes a sizable walking structure, not necessarily coastal.
*The map features numerous bridges, yet only a handful of curved structures.
*The target lies within Lucent Waters.
==Solution==
Journey to the Upper Floor Trial north of Lucent Waters' fast travel point. Stand upon the bridge, facing away from the fast travel. Descend the staircase to the left, where a logic grid adorned with three orbs awaits. Resolve it to ensure all dark cells connect, eliminate dark 2x2 formations, and allocate a single symbol to every light area. Additionally, substitute letters with numbers as follows: A=8, B=1, C=4, D=2.