Doodle Line — one stroke seals the page, then the hand lets go

Doodle Line

The pen draws one connected stroke. It cannot cross a stone or return to a cell it already inked. When you let go, enemies walk from the north edge toward the south, stop on ink in their column, and breach the base where a column is empty.

Up or W is north, right or D is east, down or S is south, left or A is west. Space or H lets go. V changes the view, Esc pauses. The top of the screen is north, and column numbers start at 1. Changing the view leaves the stroke where it is. This page stays on this screen and is not saved on the device.

Strokes
0/8
Seed
0

1 Waiting north · 3 Waiting north

  1. 1Stone
  2. 2Empty
  3. 3Threat
  4. 4Empty
  5. 1Pen
  6. 2Empty
  7. 3Stone
  8. 4Empty
  9. 1Threat
  10. 2Stone
  11. 3Threat
  12. 4Empty

Open strokes East · South

Stroke

How to play

The top of the screen is north and the bottom is the base. The left is west, and column numbers start at 1. The pen is already down on the first cell and continues one cell at a time. Off the page, a stone, or ink already drawn is not a step. You do not win before letting go. Letting go walks each threatened enemy from the north until the northernmost ink in that column, and an empty column breaches the base. Failing to let go within 8 strokes loses. The view button does not change the stroke. This page stays on the screen and is not saved on the device.

Origin & history

Doodle Line is an original OIYO puzzle: you do not shoot the enemies, you choose which columns one connected stroke will seal. Four pages were checked by hand; a seed picks one. It uses no map or audio from another game.

FAQ

Does the same seed always build the same page?

Yes. The seed picks one of four pages that were checked ahead of time. The enemies are not walked again every frame, so a shared address is the same page.