About Bordlr

Bordlr is a free daily geography game by Shwrk. You're given two regions and you connect them through the lands between — no account, no download, playable in any browser.

The border graph

Under every puzzle is a graph of who borders whom. For countries it starts from strict land borders, then adds exactly three permanent fixed crossings that are drivable or walkable over negligible water: the Øresund Bridge (Denmark ↔ Sweden), the King Fahd Causeway (Bahrain ↔ Saudi Arabia), and the Johor–Singapore Causeway (Singapore ↔ Malaysia). Ferry routes are deliberately excluded — that keeps the "connected by land" rule honest, and it's why island nations never appear inside a chain.

US-state puzzles use the same idea with state lines, for all 50 states plus DC.

Data sources

Country names, borders, and coordinates come from the open mledoze/countries dataset. Map shapes are Natural Earth, via world-atlas and us-atlas. Distances are great-circle measurements between region centers.

Explore the data

The same graph the game runs on powers our reference pages: the country borders atlas, the US state borders atlas, and featured border paths between far-apart places.