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Lizely

Rhythm Tap Game

Watch five original visual beat patterns, predict each missing beat, and build an exact 1,000-point run without audio or hardware.

Privacy: your files never leave your device. All processing happens locally in your browser.

How to use

  1. 1.Press Start pattern and watch each square flash once; keep the spacing in mind after the final visible cue.
  2. 2.Press the same large pad with touch, pointer, Enter, or Space when the missing circular beat should occur.
  3. 3.Repeat after one miss or continue after a correct tap. Complete all five fixed patterns for exactly 1,000 points.

About Rhythm Tap Game

Rhythm Tap Game is a five-round visual timing puzzle with one missing beat in every round. Start a pattern, watch the authored squares flash in sequence, keep the spacing in mind, and tap the large response pad when the next circular beat should occur. The game uses no sound, microphone, motion sensor, camera, MIDI device, or uploaded media. Everything runs locally in the browser with fixed Lizely timing rules.

This is deliberately different from an online metronome. A metronome produces an ongoing tempo for practice, usually with repeated audio clicks and adjustable beats per minute. Rhythm Tap Game does not generate continuous tempo, provide BPM controls, or act as a practice clock. Each round is a short single-shot prompt. The visible cue sequence ends, one beat is omitted, and your only task is to predict that missing moment. After a response, the attempt ends and the next attempt must be started explicitly.

The five patterns are deterministic rather than random. Early rounds use a steady spacing that introduces the interaction. Later rounds use shorter intervals or alternating short and long gaps. The visual design keeps completed cues visible while the current square briefly pulses, then leaves a dashed circular position for the response beat. The interface never displays a target timestamp, countdown to the answer, hidden correct marker, or automatic answer label.

Timing is evaluated with the browser's monotonic performance clock. Starting an attempt records an explicit start timestamp. Every cue and the response target is represented as an authored offset from that start. When you tap, the game subtracts the round's target time from the tap timestamp and compares the signed difference with that round's inclusive timing window. The first round accepts the target plus or minus 130 milliseconds; the five authored windows narrow gradually to 85 milliseconds. The exact endpoints count as correct, while one millisecond beyond either endpoint is early or late.

Each correct response awards exactly 200 points. Correctly completing all five patterns produces the fixed maximum score of 1,000. A first distinct miss in a round can be repaired by starting that same pattern again. Repeating the same miss type does not add a second error: multiple early attempts still count as one early signature, and multiple late attempts still count as one late signature. Recording both an early and a late signature in the same round closes the run. Restart resets the first round, score, miss signatures, feedback, and active attempt.

The timing state is intentionally separate from rendering. Pure game functions receive timestamps as explicit arguments, which makes boundary behavior reproducible in tests and avoids reading the clock during React rendering. Animation frames update only the visible pulse presentation. The requestAnimationFrame loop is absent while the game is ready, completed, or locked. If the document becomes hidden during an active pattern, the frame loop stops and that attempt is canceled without recording a miss. Returning to the page lets you start the same pattern again.

Pointer, touch, and keyboard input share one real button. The control remains in the same DOM position while its label changes between Start pattern and TAP, so focus does not jump between separate controls during an attempt. Keyboard players can focus the pad and use Enter or Space for both actions. Touch users can press the large pad, whose height is comfortably above the minimum touch target. If the run completes or deadlocks, input freezes and focus moves to a readable terminal status; the shared GameShell Restart control remains available.

Automated logic tests pin all five literal patterns and verify the timing window at target minus one millisecond outside, both inclusive endpoints, the exact target, and target plus one millisecond outside. They separately cover early, correct, and late responses; repeated same-side miss deduplication; an early-plus-late deadlock; repair after a first miss; exact 200-point progression to 1,000; invalid and non-monotonic timestamps; hidden-page cancellation; animation-frame states; Restart equality; and terminal immutability.

The game stores no gameplay history on a server and makes no network request. If browser local storage is available, the shared game shell saves only the best completed score on that device. Blocking local storage removes that convenience without affecting play. No account, download, or permission prompt is required.

Rhythm Tap Game is fixed entertainment, not a measurement instrument. Browser scheduling, display refresh, input hardware, operating-system load, touch processing, and keyboard behavior can all affect the event time observed by the page. The score does not measure, rank, diagnose, or certify rhythm, reaction time, coordination, hearing, musical aptitude, neurological function, educational readiness, or professional performance.

Methodology & sources

Define five original visual patterns as ordered cue offsets, one target offset, and one inclusive authored timing window. Start and tap reducers receive monotonic timestamps explicitly; React render never reads the clock or generates randomness. A tap is correct when abs(tapTime - startTime - targetOffset) is within the round window, early below it, and late above it. Each correct round awards 200 points for an exact maximum of 1,000. Miss signatures are keyed by round and early/late side: the same side deduplicates, the first distinct miss is repairable on a new attempt, and the second distinct side deadlocks. Invalid times, inactive phases, and terminal states are atomic no-ops. requestAnimationFrame drives only visual cue frames while playing and visible; hiding the document cancels the active attempt without a miss. The five patterns, offsets, windows, score, and failure policy are original recreational rules, not a tempo standard, hardware measurement, diagnostic task, or ability claim.

Frequently asked questions

How is this different from a metronome?
A metronome generates continuous adjustable tempo, often with sound. This game presents five short silent visual sequences and asks for one predicted missing beat per round.
Can I play with a keyboard or on a phone?
Yes. Focus the large pad and use Enter or Space, or tap the same control with a pointer or touchscreen.
Does the score measure rhythm ability or reaction time?
No. The windows and patterns are original entertainment rules, and browser, display, operating-system, and input latency can affect a session.

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