English-to-Chinese Quiz app to practice core set of 250 成语 required for Singapores O Level Higher Chinese. Companion to 成语 Flashcards app, to choose correct answer among 4 成语 from a given explanation. Enabling "Incremental DB" allows for Quiz to run with incremental sets of 10 成语 before including the next 10 in each subsequent round. Disabling "Incremental DB" will test the full 250 成语.