NIB
NIB
Level 03 · One Way In. One line is the only way across, so everything on your side has to be drawn before you take it.
- 01Tap any node to put the nib down, then tap a neighbour to draw the line between them.
- 02Two nodes are ringed again, so the line starts on one of them and ends on the other.
- 03One line is the only way between the two halves. Take it early and the ten lines behind you can never be reached.
NIB, One line. Every edge. Never lift.
A wireframe figure of nodes and straight lines. Put the nib down on a node, then travel along the lines, drawing each exactly once and never lifting. That is an Euler trail, and whether one exists is decided before you touch it: count the lines meeting each node, and the only nodes with an odd count are the only places the line may begin and end. When a figure has none at all, the line may begin anywhere, and it has to come home. Counting is necessary and it is not always sufficient: a figure can pass the count and still be lost, when the order you drew in has cut you off from the rest of it.
- 01Tap any node to put the nib down. Tap a neighbour to draw the line between them.
- 02Every line must be drawn exactly once, and the nib is never lifted off the paper.
- 03ODD counts the nodes with an odd number of undrawn lines. It may never rise above two.
- Level 01 · Two Endspar 12
Nine nodes, twelve lines, nothing dangling. Only two nodes carry an odd count, and they are the only places the line may begin and end.
- Level 02 · Closed Circuitpar 14
No node is odd, so every start is legal and the stroke has to come home. The only place you can be trapped is where you began.
- Level 03 · One Way Inpar 17
One line is the only way across, so everything on your side has to be drawn before you take it.
controls: Tap a node to draw the line to it
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