"2択で攻略！世界のワケアリ美少女" is a quiz game for iPhone that allows players to progress through the story by making choices between two options. The game aims to bring happiness to slightly unusual and mysterious girls from around the world, including yokai, strange beings, and ghosts. Players must be careful as making the wrong choice can lead to a bad ending.

All the questions in the game are completely free to play. The game also welcomes gameplay videos from content creators without requiring any permission.

To play the game, players need to follow these steps:

1) First, confirm the question.

2) Choose one of the two options.

3) If the answer is correct, players can proceed to the next question.

The game features various situations, including Frankenstein, Dullahan, Mermaid, and Noja Loli Kyubi, among others.

With its quiz format and unique characters, "2択で攻略世界のワケアリ美少女" offers an entertaining experience for players who enjoy making choices and exploring different storylines.