I’ve had this game for a few months now, and I’m really enjoying it. You can choose the topics you wish to study, the length of the games you play, and the continents you want to focus on. As you level up, you unlock more options for games, which is an incentive to keep playing!
It requires lives to play the games, and XP to level up, but both are extremely easy to acquire. You earn a life every 5 minutes, so you’re not forced to wait days/watch ads/pay money.
Speaking of money, this game has an awesome currency and leveling system. The more you play, the more medals you earn, which boost your XP. You unlock more game modes as you go along. You can collect chests, hints, and extra lives and trade these in for items you want more. Best of all, it’s entirely free.
I totally recommend this game for any geography nerds who want a fun way to pass time.