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How to play Wickline

The goal

Draw one fuse from the spark ✦ to the purple firework. It must pass through every cell exactly once, moving up, down, left or right.

The spark starts with a number. Every cell the fuse passes changes it: +3 adds 3, −2 takes 2 away, ×2 doubles, ÷3 divides by 3.

A checkpoint "= 12" on a cell means the number must be exactly 12 right after the fuse passes that cell. The firework always has one: the final number.

Drawing

• Drag from cell to cell to lay the fuse. You can start anywhere and join pieces later.
• Drag over a line to remove it, or press Undo.
• Tap the gap between two cells to mark ✕: "no fuse here". Tap again to clear it. ✕ Mark mode lets you drag marks.
• The grey numbers show the fuse's number so far, counted from the spark. Checkpoints turn green ✓ or red ✗.

New rules (one every 20 levels)

Chapter	Rule
1	+ cells only. Learn to count along the fuse.
2	− cells. The order of the cells now changes the totals in between.
3	× cells. Right after ×2 the number is even; after ×3 it is a multiple of 3.
4	Walls: the fuse cannot cross them.
5	One-way cells: the arrow shows where the fuse leaves.
6	÷ cells: the number must divide evenly when the fuse arrives.
7	Numbered cells ① ② ③ must be reached in that order.
8-10	Bigger boards with every rule, fewer checkpoints and harder steps.

Is there always one answer?

Yes. Every puzzle is checked by a solver that thinks like a person: it only uses steps you can see, and it proves there is exactly one fuse. You never need to guess.

Useful steps

• Corners: a corner cell has only two neighbours, so the fuse uses both.
• Full cells: once a cell has its fuse in and out, its other sides are ✕.
• No loops: never join the two ends of the same piece.
• Count from the spark: if the next cell's checkpoint cannot match, the fuse cannot go there.
• Count back from the firework: undo the operations backwards from its final number.
• Bridges: if removing a link would cut the board in two, the fuse must use it.
• What if: on hard levels, imagine a line and follow the easy steps; if a cell gets stuck, the line is wrong.

Hints and stars

A hint explains the solver's next step: first where to look, then why, then it shows you. You get one free hint a day; more cost Wicks 🕯 or come from the shop.

★ solved · ★★ without hints · ★★★ without hints and without a wrong checkpoint.

Keyboard and screen readers

Tab to the board. Arrow keys move between cells. Shift + arrow lays or removes the fuse towards that side. X then an arrow (or Alt + arrow) marks ✕. U undoes. Each cell is read with its operation, checkpoint and the fuse's number there.

Settings have colour-blind colours, reduced motion and larger text.

Daily and Weekly

One Daily Challenge for everyone each day, timed by the server, with a leaderboard. Five Weekly puzzles each week. Past dailies can be played for practice.

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