The Math Attax app uses flag icons by Freepik from www.flaticon.com
The Math Attax app uses these sounds from freesound.org:
Clang (mod) by druidic — https://freesound.org/s/232031/
FragSound Gong by obstgegenrechz — https://freesound.org/s/267980/
Synthesized gong/bell/cymbal by paulnorthyorks –https://freesound.org/s/162119/
PING_PING.wav by MATTIX — https://freesound.org/s/445058/
timer ends_time up.wav by Cabeeno Rossley — https://freesound.org/s/126426/
bong.wav by OtisJames — https://freesound.org/s/215774/
Alarma_loop by Jm_at — https://freesound.org/s/423141/
gun8.wav by Tissman — https://freesound.org/s/456170/
SHOOT003.mp3 by jalastram — https://freesound.org/s/221431/
shoot01.wav by V-ktor — https://freesound.org/s/435418/
laser04.mp3 by Taira Komori — https://freesound.org/s/215430/
Laser SFX.wav by TiesWijnen — https://freesound.org/s/339040/
OSf – LaserDry.wav by SA_Ionov — https://freesound.org/s/467395/
laser04.mp3 by Taira Komori — https://freesound.org/s/215430/
laser04.mp3 by Taira Komori — https://freesound.org/s/215430/
8.wav by stomachache — https://freesound.org/s/29813/
boing.wav by dayvonjersen — https://freesound.org/s/156236/
M tyre boing 2.aif by AtevonHes — https://freesound.org/s/275057/
Cartoon Boing.wav by reelworldstudio — https://freesound.org/s/161122/
intro_milkyway.wav by levelclearer — https://freesound.org/s/186678/
OSD text 1.wav by jobro — https://freesound.org/s/33551/
splash9.wav by tran5ient — https://freesound.org/s/190085/
Splash, Small, A.wav by InspectorJ — https://freesound.org/s/416710/
target acquired.wav by tim.kahn — https://freesound.org/s/106314/
Blip 5 by jamesabdulrahman — https://freesound.org/s/262861/
countdown 3 2 1 jump by sorrentix — https://freesound.org/s/412018/
Puff blow 01.MP3 by VKProduktion — https://freesound.org/s/215850/
zero a.wav by thatjeffcarter — https://freesound.org/s/330856/
8-Bit Arcade Video Game Start Sound Effect, Gun Reload and Jump !! by FartBiscuit1700 — https://freesound.org/s/368691/
GoodResult.wav by unadamlar — https://freesound.org/s/341985/
Playground Runaround by shortiefoeva2 — https://freesound.org/s/405220/
Whoosh_01.wav by timmy_h123 — https://freesound.org/s/160500/
Tonal_Impact_E by nabz871 — https://freesound.org/s/315725/
S001_Countdown_Signal.wav by Pól — https://freesound.org/s/385928/
Squeaking target hit by ProjectsU012 — https://freesound.org/s/341703/
Projectile Hit by unfa — https://freesound.org/s/193429/
a shot by Halgrimm — https://freesound.org/s/156895/
Laser_09.wav by LittleRobotSoundFactory — https://freesound.org/s/270536/