Bridges
Connect the islands into one network
Drag from an island to cycle single, double, then no bridge. Right-drag marks no bridge. Tap selects an island; use the direction buttons. Click or Space locks it. Arrow keys move; Ctrl or ⌘ + arrow builds; Shift + arrow marks no bridge. Enter then arrow also builds. Ctrl or ⌘ Z undoes; Shift Z redoes.
Progress saves on this device.
How to play
Connect the numbered islands with horizontal or vertical bridges. Each island needs exactly its number of bridges. A double bridge counts as two. Bridges cannot cross or pass through islands, and all islands must form one connected network. Loops are allowed.
Mark an empty connection with × when you know it has no bridge. Mark it again to clear it. Locking an island (✓) protects its connections; unlock it to change them. A ! flags too many bridges, an impossible clue, or a closed group disconnected from the other islands.
Numbers 1–8 jump to the nearest matching clue. G toggles possible bridge guides. Press Enter twice to lock an island. Solve reveals the upstream solution and does not count as a win. Restart clears this puzzle’s moves and history.
Puzzle by Nikoli. Engine: Simon Tatham’s Bridges, contributed by James Harvey. MIT license and credits.