@ SIGN SPECIAL BOARD
Level Analysis & Solution Strategy
C15 @ Sign is shaped like the email "@" symbol. Its spiral loop creates a continuous dependency chain from the outer swoop to the inner letter "a".
At-Sign Level (C15): Board Solution & Analysis
The internet "@" symbol rendered in winding arrow polylines.
Board Specifications
| Attribute | Specification | Strategic Note |
|---|---|---|
| Arrow Count | 72 arrows | Requires structured perimeter sweeps |
| Grid Dimensions | 42×42 | Compact tight grid |
| Opening Free Exits | 11 arrows (15.2%) | Immediately playable on turn 1 |
| Solvability Status | 100% Machine Verified | Every stuck position is a reading error |
Opening Strategy & Walkthrough
1. Initial Border Sweep
Unwind the outer tail swoop on the bottom-right before attempting the inner "a" loop.
2. Key Blocker Obstacle
The inner "a" loop is completely trapped until the outer "@" tail is unwound.
3. General Arrow Logic Rule
An arrow leaves the board only when every cell between its head and the outer edge is clear of non-removed arrows. Removing one arrow unlocks the lanes behind it.
Frequently Asked Questions
What is the strategy for @ Sign level?
Unwind outside-in following the spiral tail.