Typing Race — asset credits
Licenses were checked on each source page on 2026-09-27.

SPRITES, MUSIC AND GAME SOUNDS — CC0 1.0 (public domain dedication), free for commercial use, credit not required
"Ninja Adventure - Asset Pack" by Pixel-boy and AAA
  https://pixel-boy.itch.io/ninja-adventure-asset-pack
  License: https://creativecommons.org/publicdomain/zero/1.0/ (LICENSE.txt in the pack)
  Files were taken from a copy of the pack in https://github.com/MarioLDD/Kuroshiro-adventure (Assets/NinjaAdventure).

runners.png   Actor/Characters/<name>/SeparateAnim/Walk.png of Boy, OldMan, Woman, Hunter, Monk, Princess,
              FighterWhite, MaskFrog, Lion, NinjaYellow, EggGirl, Cavegirl and Villager, placed side by side (64×64 each). Pixels unchanged.
faces.png     Actor/Characters/<name>/Faceset.png of the same characters, side by side (38×38 each).
flags.png     Backgrounds/Animated/Flag/Flag{Red,Blue,Yellow,Green}16x16.png, stacked.
audio/music.mp3     Musics/"20 - Good Time.ogg" (converted to MP3)
audio/overtake.mp3  Sounds/Game/Bonus.wav (converted to MP3)
audio/win.mp3       Sounds/Game/Success3.wav (converted to MP3)
audio/stumble.mp3   Sounds/Game/Hit.wav (converted to MP3)

CROWD SOUNDS — CC BY 4.0 (credit required)
"Free Crowd Cheering Sounds" by Gregor Quendel
  https://opengameart.org/content/free-crowd-cheering-sounds
  License: https://creativecommons.org/licenses/by/4.0/
audio/cheer.mp3     from "04 - Strong cheering - II - Short" (trimmed 5.0–8.6 s, faded, loudness-normalized)
audio/finish.mp3    from "03 - Strong cheering - I" (trimmed 5–12 s, faded, loudness-normalized)
audio/crowd.mp3     from "10 - Ambience" (trimmed 18–30 s, faded, loudness-normalized)
Changes: trimmed, faded, converted to mono MP3 and loudness-normalized.

The track, grass, curb, ad boards, stands and crowd, finish gate, clouds and podium are drawn by the game code.
The starting gun, footsteps, wind, finish bell, camera shutter and countdown beeps are synthesized in the browser (Web Audio).
The "On your marks" line uses the device's own speech voice (Web Speech API).