Nothing Left Unseen

Nothing Left Unseen
Reveal every walkable tile of the fen.

Every walkable tile you can reach from the Holdfast must have been seen once. Open water and sealed pockets do not count, but the percentage is rounded down, so one unseen corner holds it at 99. It is far harder than Charted the Fen V, which counts a region on its first seen tile: the recorded run had all 64 regions at 25:20 and the last tile only at 57:20.

How the fen gets seen

• Every villager, soldier and building sees around itself: 9 tiles by day, 5 at night, 3 on a Fen-mist night. Seeing is kept: ground once seen stays on the map.
• Soldiers who are not needed at home go out and scout, one spot after another, until no spot is left. So an army, and time, is what uncovers the far corners.
• The run does not have to be won: the achievement comes the moment the last tile is seen.

The run, in order

1. New Game, seed 75, Begin. Press F1 for the autopilot and 3 for speed ×8.
2. Let it grow and keep an army: its soldiers broke all eight lairs by 27:45 (Unmaker IV), which also clears the way for the scouts.
3. Charted the Fen V (all 64 regions) came at 25:20. From there it is the corners.
4. Nothing Left Unseen unlocked at 57:20 (tick 20,641), with the Causeway not yet laid.

The recorded run

One game on seed 75 from a fresh profile, played by the game's autopilot (F1) at the game's ×8 speed. The run is left from the pause menu once the achievement is announced, and the video ends on the in-game Achievements screen. The badge on every frame says who played; the game's own music, no commentary.

▶ Play the whole run

What goes wrong

• A fen that falls first: the far corners take an hour of game time, so the holding has to last.
• The count is refreshed every 240 ticks, so the notice can come a little after the last tile is seen.
• On other seeds the autopilot often wins before the last corner is seen; this seed was chosen from a scan of 78 because its run lasts long enough.