A kind of minesweeper-like game where you're trying to catch a single mine.
Day 4.
There are a couple of "tricks" to catching it quickly that aren't explained in the intro message.
The mine's movement is somewhat deterministic. Stop reading now if you want to try it first without being spoiled.
It'll always try to move away from the tile you scan if possible.
Initially, the mine moved randomly but I found this lead to a fairly tedious exercise in removing most of the water in order to corner it after you'd used your first few turns to triangulate the mine's position.
The spawn location of the mine is entirely deterministic based on which tile you scan first. Once you've tried starting in the same spot a couple of times, you can figure out exactly where it spawns for that seed.
Let me know if you can find a five turn win.
