Difficult-to-Read Place Names Quiz: Conquering Japan

This is a quiz where you select a prefecture from a map of Japan and guess the readings of place names and station names in that prefecture (iPhone). When you complete all the problems for one prefecture, that prefecture on the map becomes colored and you achieve "conquest."

・All readings have been verified using official materials from municipalities, railway companies, and other sources
・For place names with two official readings, both answers are correct
・No time limit. After solving, you see the reading and a one-line explanation
・"Easy" and "Normal" are multiple choice (4 options), "Difficult" requires hiragana input
・Free: 470 questions (47 prefectures × 10 questions) • One daily question at midnight • Playable without internet connection • No membership registration required

No advertisements appear while solving problems. There are problem packs and an "Remove Ads" option (one-time purchase).
The map was created based on the Ministry of Land, Infrastructure, Transport and Tourism's "National Land Numerical Information (Administrative Division Data)."