It's an app with cute cows as the theme. Main functions: We have two main modes: 1. The difficulty is determined by the number of pictures, and the countdown in this mode is fixed and relatively simple. 2. Count down time to determine the difficulty, this mode needs to find the replaced picture in an extreme reaction time, which is more difficult. We have designed a lot of pictures of cow elements, and you can choose your favorite mode on the homepage to challenge your eyesight. Constant attempts can exercise your concentration and divergent thinking, and get to know the cow more vividly!