Puzzle 9

Puzzle 9 is one of the mysteries in Islands of Insight.
==Hints==
*Chains of puzzles are designated as Trials on the map.
*Ascertain the 2-shaped structure from a vantage point in Serene Deluge.
==Solution==
Commence near the Cornered Numbers Trial in Lucent Waters. Head north along the river until encountering a puzzle box atop the aqueduct separating Lucent Waters from Serene Deluge. Resolve it, avoiding 2x2 light formations, 4x1 dark configurations, and ensuring connectivity of all dark cells.