Choose by what you want to work out. Identifying a country outline, following a chain of neighbours, and interpreting an unfamiliar landscape are different puzzles. EarthGuessr publishes this guide and is one of the games described below.
A short puzzle to compare with friends
Worldle gives you a country or territory outline and distance feedback on your guesses. Globle uses proximity feedback, while Travle asks you to connect places through neighbouring countries. Try one format first; a daily release can provide a shared question without organising a live session.
An image you can investigate
GeoGuessr uses street imagery. EarthGuessr uses satellite imagery, where coastlines, field patterns, roads, and relief provide the evidence. In either case, the useful part of a missed round is looking again after the answer appears. A familiar-looking field is a hypothesis to check, not proof of a country.
A specific gap in your map knowledge
Seterra's web quizzes cover country locations and other geography topics. Choose a region you want to learn and repeat the exercise with a different map afterwards. A good score on one layout does not establish that you can locate the same places in another view.
Playing with a mixed group
Give people a practice round and enough time to explain a guess. For a shared-screen game, pairs can submit one answer together. Check accounts and room limits before choosing a live multiplayer format; EarthGuessr's multiplayer flow requires sign-in.
These games offer practice at their particular tasks. Claims about improved general memory or lasting learning need evidence beyond a session's score.