Piano Keys Coding Problem

CodingRobloxLast reported August 2026Low Frequency
Reported
1× across candidate reports
First seen
August 2026
Last reported
August 2026
Reported outcome
unknown

Problem Overview

Implement an interactive 6-key piano interface using vanilla HTML, CSS, and JavaScript (no frameworks or third-party libraries). The piano has six keys corresponding to the notes C, D, E, F, G, and A. Each key has a pre-written CSS class .key.active that renders a 'pressed' visual state. Requirements: 1. Mouse…

  • 2 candidate-reported follow-ups — the exact probes interviewers asked, with the trigger for each
  • The rest of the problem statement — full requirements, constraints, and edge cases
  • Approach and trade-offs — what passing candidates did, and the mistakes that sink people
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Verified Source
Every question is reconstructed from multiple independent candidate reports. Verbatim follow-ups, not invented ones.
Codex Fact-Checked
Technical claims, formulas, and scale numbers are reviewed against primary sources.
Interviewer Follow-ups
The exact follow-ups reported by candidates, with the trigger that prompts each one — plus the mistakes that sink people.
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