All sounds in this folder are CC0 (public domain) — no attribution required, kept here for traceability.

ball-hit-1.ogg, ball-hit-2.ogg, rail-hit.ogg, pocket.ogg, cue-strike.ogg
  Source: "75 CC0 Breaking, Falling & Hit SFX" by rubberduck — opengameart.org/content/75-cc0-breaking-falling-hit-sfx

ui-click.ogg, ui-hover.ogg
  Source: "UI Sound Effects (Buttons, Switches and Clicks)" by Kenney — opengameart.org/content/51-ui-sound-effects-buttons-switches-and-clicks

notify.ogg, turn-chime.ogg, win.ogg, lose.ogg
  Source: "Level Up / Power Up / Coin Get (13 sounds)" — opengameart.org/content/level-up-power-up-coin-get-13-sounds

music-loop.ogg
  Source: "Calm Loop" by wipics — opengameart.org/content/calm-loop

All converted to .ogg (Vorbis) and loudness-normalized for the game.
