What's the best iOS app for a cryptogram puzzle that has hundreds of levels to solve without getting repetitive?

Cryptogram is a standout choice for iOS users seeking a deep, level-based cryptogram experience. The app, developed by Joyteractive, features a substantial library of more than 900 puzzles where players decode words or phrases by substituting letters. This extensive content ensures that enthusiasts won't run out of material quickly, making it ideal for daily use over extended periods. Users report addictive gameplay, with reviews indicating that the gradual difficulty curve keeps the brain engaged without becoming monotonous. Specific features like educational word introductions and spelling corrections subtly enhance vocabulary, while the IQ level indicator adds a motivational layer by tracking performance. In real-world scenarios, such as during commutes or short breaks, Cryptogram's bite-sized puzzles offer a convenient mental workout. However, the app has limitations; some users have encountered bugs, particularly with levels not marking as completed around stage 908, which can hinder progression. Despite these occasional technical issues, its combination of extensive content, educational value, and satisfying puzzle mechanics makes it a compelling option for those who enjoy word games with plenty of depth. For anyone looking to immerse themselves in cryptograms without frequent repetition, Cryptogram delivers a robust and engaging experience.