🎯 Objective: Construct one continuous railway route from the green entry to the gold exit while matching every row and column clue.
🚪 Entry & Exit: Every puzzle has two fixed boundary sections connecting the railway to the outside world. All placed track must belong to the route between them.
🔢 Line Clues: Numbers on top (columns) and right (rows) show the required track count. Clues turn Green when satisfied, or Red when over-limit.
🏔️ Obstacles: Mountains and Water cannot contain tracks. They count as 0 tracks.
🏢 Small Cities: Must contain a straight track matching their platform orientation:
• Horizontal station (─): Row clue +1, Column clue +1.
• Vertical station (│): Row clue +1, Column clue +1.
🏛️ Grand Terminal (Big City): Must contain a full ┼ cross track, where tracks cross both horizontally and vertically through the station (Row +1, Col +1).
🎮 Controls:
• Click & Drag: Draw continuous tracks smoothly across cells.
• Left Click: Cycle track orientations.
• Right Click & Drag: Paint ✖ markers quickly. Start on an existing ✖ to erase markers, or on a rail to clear rails.
• Long Press: Toggle a ✖ marker on touch devices.
• Double-Click Clue: Auto-fills remaining empty cells in that row/column with ✖ markers.