How does the rhythm game judge a tap?
Every note can receive a perfect, great, or good judgement based on how close the tap is to its timing point. The windows are symmetric on either side, so arriving a little early is measured by the same rule as arriving late.
What does the results screen show?
At the end of a chart, players see a breakdown of their judgements, the combo they built, and a letter grade. That makes the result more useful than one score alone, because a player can see whether missed notes or timing accuracy affected the run.
Can I add my own music chart?
Founders can provide a chart as a data file, and the game rejects notes that could never be hit. This protects the player from a broken pattern before a session begins. A custom chart should match its music, keep a readable pace, and give players time to learn new sequences.