BORDERLINE — press kit
Five countries. One globe. Every day.
One paragraph
Borderline (borderline.world) is a free daily geography game played on a 3D globe. Every player in the world gets the same five countries each day. Tap them on an unlabelled globe in three tries or fewer, share the spoiler-free emoji scoreline, and see what percentage of that day's players you beat. Beyond the daily, a spaced-repetition Learn the World mode schedules every country by how well you know it and paints your personal mastery map onto the globe itself. No account, no ads, no install. It runs in the browser, works offline as a PWA, and player data never leaves the device.
Fast facts
| URL | borderline.world |
| Price | Free, no account, no ads |
| Platforms | Any modern browser; installable PWA (iOS/Android/desktop), fully playable offline |
| Countries | 166 playable (UN members + Kosovo), Natural Earth boundaries |
| Modes | Daily challenge · Practice (regions, difficulty, flags, silhouettes) · Learn the World (spaced repetition) · Past-dailies archive |
| Privacy | Scores and learning progress stored only in the browser; cookieless analytics; Do Not Track honoured |
| Contact | hello@borderline.world |
Media
Right-click to save. All assets may be used freely in coverage of Borderline.
Background
- Built as a love letter to the daily-puzzle genre: one shared puzzle, a spoiler-free emoji share grid, and zero friction, no signup, no paywall.
- The globe is rendered from scratch on a canvas (D3 orthographic projection, two levels of map detail, custom inertia/zoom), no game engine, no framework.
- The Learn mode uses a Leitner-style spaced-repetition ladder: countries you miss return within minutes; countries you nail wait days, then weeks.
- Anonymous daily percentiles are computed from a ~100-integer histogram per day. The entire backend state for a day fits in a tweet.