Echo Find Depths

Echo Find Depths is an attention and observation exercise set in a quiet underwater scene. You work on a grid that stays hidden until you send a short sonar pulse. For a few seconds, silhouettes of fish, bait, and floating debris appear in their cells. When the pulse ends, the grid closes again. Your task is to mark every cell where the target species was shown, without confusing it with bait or debris that appeared at the same time. Rounds grow harder as you continue. The board expands, a second fish type may join the pulse, and later stages can shift positions between the flash and the question. Controls remain simple taps on a grid, but the picture you must hold in mind becomes richer. A wrong mark ends that attempt, yet you can replay immediately and compare results with earlier runs saved on your device. Two modes offer different ways to practice. In precise search mode you focus on one target species per question. In target chain mode you follow a sequence of species across the same pulse, marking each location in order. Both modes share the sonar rules from onboarding and run entirely offline without accounts or network access. Your progress stays local. Echo Find Depths stores personal records, best streaks, attempt history, gameplay settings, onboarding completion, and progress for a daily offline round keyed to your device calendar date. Open the streak board to review consistency, or visit the daily sonar seed for one structured challenge each day.