The Sky Post

Choose an island, then its nearest neighbour in the same row or column. Choose the same pair again to cycle through one bridge, two bridges, then none. Each island needs exactly its number of bridges; a double counts as two.

Bridges cannot cross or skip an island. Loops are allowed. Every island must belong to one connected network. Red plaques show too many bridges; the small fraction shows the current count.

Check the route follows bridges that really exist and names any cut-off addresses. Being reachable does not prove the numbers are right. When all numbers and the whole network are correct, Send the post delivers to every address, returning along real bridges where needed.

Keyboard: Tab to any island, use arrow keys to move between islands, then Enter or Space to select it. Keep the first island selected to change its connection again. Choose the selected island to release it and begin from another one. Undo uses the button or Control/Command Z. Reset asks before clearing the archipelago.

Skip opening, Skip route and Skip deliveries give their result immediately. Look closer inspects an address; Visit next moves through the same ten islands. Build bridges returns to the steady whole-map view and parks the cart. Simple view has the same puzzle and controls on an ordinary scrollable board. Reduced motion uses direct construction and delivery results.

Your bridges save in this browser, separately from regular Hashi. There is no account or device sync. Undo lasts for this visit. If storage is unavailable, keep the tab open to keep your bridges.

Start at the sorting house: it needs four bridges and has only two neighbours. Look for islands whose remaining connections have very little capacity. Count both spans of a double.

Separate groups can have correct numbers. Leave a way to connect the whole sky. Changing a bridge cancels the cart and clears delivery flags so the world always reflects your current network.

No route has been checked yet.