Border Logic
Twelve candidates. Truthful clues. One country.
Daily country deduction game
Every clue removes part of the world
Border Logic is a daily geography logic puzzle. Use objective land-border, coastline and neighbour-count constraints to cross impossible countries off a fixed board. Reveal clues progressively, reverse any note, and leave the one country that satisfies every statement.
12
candidates
1
unique answer
10
verified boards
0
routes to build
How to play
Make reversible notes, then commit
Apply each constraint
Test the visible countries against one factual statement at a time.
Cross out and reconsider
Eliminations are notes, not permanent answers. Reverse them whenever the logic changes.
Trust the unique solution
A validator proves the full clue set leaves exactly the authored country.
How to solve a country logic puzzle
Start with the most selective clue. “Borders Germany” can remove most of a European candidate board immediately, while “has a coastline” may remove only a few. Keep candidates possible until a clue definitely rules them out; the goal is deduction, not speed-clicking.
Neighbour counts are strongest after another clue has narrowed the region. A country with exactly four land neighbours could exist in many continents, but a landlocked country that borders Germany and has four neighbours points to a much smaller set. If your notes remove every logical possibility, undo the least certain elimination and test it again.
Border model and validation: the game counts sovereign-state land boundaries only. Maritime boundaries, dependencies, overseas territories, bridges and tunnels are excluded. Puzzle-defining clues avoid materially disputed cases. At build time, every clue predicate is applied to every visible candidate; the module throws an error unless exactly one solution remains. Last reviewed .
Border Logic is deduction, not route building. To connect countries across a shortest land path, play Travle. For free-text attribute comparison, try Countryle; for category matching use Destination Connections; and for ordering use Destination Sort.
The best journeys cross more than borders
Turn every route into a beautiful TripBook
Bring photos, routes and daily memories together in TripMemo, then share the complete journey beautifully.
- Create a TripBook for every journey
- Keep routes and memories together
- Share the complete travel story
.webp&w=96&q=75){kind=icon}
Get the App
FAQ
Border Logic questions
What is Border Logic?
Border Logic is a daily country deduction puzzle. Apply truthful land-border and coastline constraints to a fixed candidate board, cross out impossible countries and identify the one answer that satisfies every clue.
Is Border Logic the same as Travle?
No. Travle asks you to build a connected route between two countries. Border Logic never asks for a path; it is a finite logic puzzle where clues eliminate candidates until one country remains.
What counts as a land border?
The game uses sovereign-state land boundaries from one documented adjacency model. Maritime borders, dependencies, overseas territories, bridges and tunnels do not count. Disputed cases are avoided in puzzle-defining clues.
Can I undo an elimination?
Yes. Every crossed-out candidate is reversible: tap it again or use the undo control. The game also warns if your current notes eliminate every country that can satisfy the revealed clues.
How do you ensure each puzzle has one answer?
Every board passes a code-level constraint validator. The complete clue set is applied to every visible candidate, and publishing fails unless exactly one result remains and it matches the authored answer.