Borderline is the border-chain game
Each answer must share a land border with the one before it, with no country repeats, and a wrong or repeated answer ends the run. Dead ends don't kill you outright — the game demands a jump to the single closest unused country, and guessing that wrong is what ends most long runs. The map fills in as you chain, so you can see exactly where you painted yourself into a peninsula. Overseas sovereign land borders count too, which produces the chains that feel like cheating until you check a map. It is a survival format rather than a daily — you play for the longest chain, not one shared puzzle. A second mode runs the same rules on US states.
Customs is the border-desk deduction game
Where Borderline is about adjacency, Customs is about rules. City dossiers arrive at a border desk and you stamp Admit or Deny by working out the hidden geography rule from real city and country facts: continent, coast, island status, capitals, rivers, elevation. One wrong stamp ends the shift.
Outsider is the odd-one-out round
Outsider shows five places where four share a real geography trait — often a border or adjacency fact — and gives you 30 seconds to find the one that does not belong. It is the fastest way to stress-test the same border knowledge Borderline builds.