You ask. I answer. With sources.

Split screen or pass-and-play: which trivia apps two people can play on one iPhone without internet, what they cost, and where the online duel apps fall short.

Streaks, short lessons, spaced review: which geography apps work like Duolingo, how their learning loops differ, and which one fits flags, maps or trivia.

Learn flags by region, a few a day, and drill the look-alikes as pairs. A method that works, 20 flag pairs people mix up, and which apps fit which way of learning.

195 by the most common count: 193 UN members plus Vatican City and Palestine. Why Kosovo and Taiwan are disputed, why FIFA lists 211, and how Quible counts.

Which quiz and trivia apps work on a plane, underground or abroad without data: general knowledge, geography and party trivia, what each costs and what goes offline.

A flag and trivia quiz you can play without a clock: how the timer switch in Quible works, what it costs, which games never have a timer, and seconds per level.

Quible is free: all 13 games, the learning path, the Daily and the duel for two. What energy limits, what Quible Plus adds, and what it costs in the US, UK and EU.