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Sequence memory training on a clean four-symbol stage. Four large keys are laid out in a four-quadrant board, and each key has its own distinct shape, inner pattern and letter code, so every step is recognizable without relying on color alone.

How it works
Every round demonstrates a short sequence: the keys light up one by one. Watch carefully, then reproduce the order by tapping the keys. Each correct round adds another step, gradually building longer sequences. The demonstration pace naturally quickens from 700 ms down to 350 ms as the sequence grows, but never so fast that the steps blur together.

Three practice modes
Classic: each successful round appends one additional step to the end of the sequence.
Reverse: the sequence is shown forward, but you must input it from last to first.
Gap: one step is hidden during the demonstration, and you complete it from the four candidates.

Each mode is offered in several difficulty stages with different starting lengths and speeds. Beginner levels start at three steps; advanced stages begin longer and move faster.

Learn from mistakes
You have three mistakes in total per session. A mistake pauses the game, shows the correct key at that spot, and replays the demonstration only up to the step before your error, so every failure teaches something instead of just ending. Before you begin inputting, you may replay the demonstration once per round; using the replay slightly reduces that round's score.

Clear scoring
A round scores more points for longer sequences and later rounds. Clean rounds build a streak bonus, and using a replay lowers the round's score to 85%. The scoring rules are explained in the in-app guide.

Daily challenge
A fixed challenge sequence is generated from the local date, so the same date always gives the same challenge. You can retry as many times as you like during the day, and only your highest score is kept.

Records and trends
The app keeps your highest score and longest sequence for every mode, the results of your last ten games, and the positions where you most often make mistakes, all shown as plain facts to help you practice deliberately.

Preferences
Adjust sound, haptics, demonstration speed, graphic marks, theme, reduced motion and larger symbols to match how you play. Key information is always shown through shape, pattern and letter code as well as color.

Private and offline
Everything runs locally on your device. No account, no ads, no tracking, no network connection needed. Scores and preferences are stored only on your device and can be removed by deleting the app. This app is a light memory exercise for personal entertainment; it does not measure intelligence, health or professional ability and offers no medical or cognitive-improvement claims.