札落とし競技かるた札認識速度アップツール is a free Android game developed by 株EXCEED. This game is designed to help players improve their recognition speed of the "kimmariji" (a specific character that determines when to take a card) in the competitive card game "Karuta" (Hyakunin Isshu). The game provides various features to enhance the learning experience.

The main feature of this app is the "Satsuotoshi" function, where players must quickly identify the "kimmariji" of the displayed card and swipe to discard it. The app keeps track of the time taken to discard all the cards and displays the total time at the end. There is also a "Weak Cards" function that allows players to focus on the cards that took longer to discard in previous sessions.

Additionally, the app offers the "Limited Display Cards" function, which allows players to select specific sets of cards or fix the direction of the displayed cards. This feature is especially useful for beginners who want to gradually increase their familiarity with the cards. The app also includes a ranking feature that evaluates the player's recognition speed based on their average operation time in previous sessions.

Furthermore, the app provides a history function that allows players to review their past practice sessions, including the content and operation time. This enables players to track their progress and practice at their own pace.

It should be noted that the app offers in-app purchases to increase the daily limit of practice sessions beyond the default 10 times. By selecting the "Increase daily play count (paid)" option and paying 300 yen, players can enjoy unlimited practice sessions without any restrictions.

Overall, 札落とし競技かるた札認識速度アップツール is a useful tool for improving the recognition speed of "kimmariji" in the game of "Karuta". With its various features and functionality, players can enhance their skills and track their progress over time.