Merriam-Webster’s Quizzitive app aims to have you master “1000 Words Worth Knowing,” and takes a fun spin on building your vocabulary. The app gives players little word quizzes that help you learn and fully understand an impressive list of words. While true word nerds will probably know many of the words in the games, it could be a good tool for kids looking to learn new words, or even just for people who want to brush up their vocabulary. The game has 10 levels overall — the words get progressively harder. The game keeps track of the words you got right and wrong, so you’ll know exactly what needs work.

The app is free to download, and the free version gets you access to the first two difficulty levels. After that, you can pay $2 to unlock further levels and get rid of ads. Speaking of the ads, they can occasionally be easy to hit by accident — particularly if you’re trying to tap something quickly while working against the clock. Still, the game is a lot of fun and a nice way to pass the time between engagements. Just make sure that you don’t get sucked in and miss your next appointment.

Free, for iOS.