Echo Reef

Ping the lagoon, read delayed sonar returns, then mark reefs with buoys or chart a safe route to the beacon.

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Charting

Pings left0

Hidden reefs0

Buoys placed0

Route length0

Ping Records

0 is the probed cell

Route

start to beacon

Echo Log

latest first

Win by either placing buoys on every reef exactly, or by drawing a connected route from S to G that does not cross a reef. Pings are limited, but marking and routing are free.