ルート21

"Route 21" is a series of brain training apps that you can easily enjoy in your spare time.
There are no forced advertisements during gameplay. It also works offline (without network coverage), so you can train at your own pace regardless of location, such as while traveling or underground.
————
■ Train Your Brain with 3 Genres
This app offers three genres: "Calculation," "Logic," and "Memory." Each has a different play time, allowing you to choose the mode best suited to your spare time.

① Route 21 (Calculation)
Within a one-minute time limit, tap the numbers on the board to match the sum of the numbers to the target value. Quickly find the correct answer from 18 cards and clear stages one after another to aim for a high score.

② Sudoku 21 (Logic)
This unique puzzle uses the rules of Sudoku to fill in the numbers, aiming for combos by making the sum of the entered correct numbers exactly "21." Utilize strategic stage skipping to compete for the highest score across three stages.

③ Memory 21 (Memory)
This is a memory puzzle where you memorize the arrangement of all cards in the first 5 seconds and make the sum of the numbers you flip over "21". If you can't remember, you can use the "Hint button" to re-memorize. Sharpen your concentration and aim for the final stage with consecutive correct answers.

④ Marbles 21 (Concentration, Precision Control)
Aim and flick your pieces with your fingertips to get them into circles and compete for points.
This is a COM-versus-COM marbles game.

⑤ Othello 21 (Logical Thinking, Spatial Reasoning)
This is a new kind of territory-claiming Othello where the first to collect 21 pieces wins. Enjoy strategic battles where the tide of the game can turn with a single move.
————
■ Key Features of This App
① No Ads During Gameplay: There are no forced ads that interrupt gameplay, so your thinking won't be hindered. *You can choose to watch video ads when acquiring game tickets or coins.
② Offline Support: Play anytime, anywhere without worrying about your internet connection. ③ Regular Updates: We plan to add new modes and difficulty levels in the future.

————
■ From the Developers
We are considering adding more fun brain training content for everyone to enjoy in this app.
We post development progress updates on X, so please contact "@kodamabiyori" with any requests or bug reports.
We would be grateful if you could share your thoughts and requests in reviews, as it encourages our development.

Why not start refreshing your brain with a genre that interests you?