Pattern Echo: keep the prefix and add one new pad
Separate watching from answering, handle repeated pad numbers correctly and build a small recall structure around the part of the sequence that stays the same.
Worked examples use the Standard board unless a different size is stated. Hard and Expert may change the board dimensions or amount of information to track.
Let the display finish before answering
Play pattern begins the display, with one numbered pad highlighted at a time. The pads do not accept answers during that phase. Wait for Your turn and enabled input buttons before repeating what you saw; clicking during playback is not a way to enter the first answer early.
There is no countdown once input is ready. Use that pause to recall the order instead of racing the display. The numbered labels let you describe the sequence with words or numbers rather than relying only on the pads' colours.
Keep the earlier prefix intact
Suppose a Standard teaching challenge uses the sequence 1, 3, 2, 3. Round one shows 1. Round two shows 1, 3; round three shows 1, 3, 2; round four shows all four numbers. The earlier part stays in the same order while one new pad is added.
After each display, ask which number was added to the prefix you already knew. You still need to enter the complete round, not just the new number. This example illustrates the rule; it is not the answer to every challenge generated by New puzzle.
Use a small grouping you can check
For that four-number example, one possible grouping is 1,3 followed by 2,3. The repeated ending does not make the two groups interchangeable: their first numbers remain different. Choose a grouping that keeps order explicit rather than turning the sequence into an unordered set of remembered pads.
Two consecutive appearances of the same pad are also separate steps. A sequence such as 2,2,4 requires two presses of pad 2 before pad 4. The dark interval between highlights marks the distinction; holding a button or counting the repeated pad only once will not substitute for two inputs.
Replay a round instead of guessing faster
A wrong press pauses the attempt at that round. Replay round shows the same current prefix again and clears its partial answer. You can also replay while input is ready if you have lost your place. Replaying is a chance to inspect the sequence again, not a new random answer.
Restart returns the same challenge to round one; New puzzle creates another sequence. Changing difficulty resets the challenge as well. These controls cancel older playback and between-round callbacks, so an abandoned pattern does not continue changing the new board.
Read the level as size and length
Standard combines four pads with four rounds, so a perfect run displays one plus two plus three plus four highlights: ten in total. Hard increases this to six pads and six rounds. Expert uses nine pads and eight rounds, giving you more possible identities and a longer final prefix.
The display does not become a rapid flashing contest at higher levels. Each highlight lasts 420 milliseconds and is followed by a 220-millisecond gap. Reduced-motion styling can remove transitions while preserving the numbered sequence. The challenge is retaining order, and your answer phase remains without a time limit.
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