Original sources

In this tutorial some files where taken from external sources.

File `assets/large_collision_sound.wav` and `assets/oryginal_sounds/large_collision_sound.wav`

Author: unfa
Link: https://freesound.org/people/unfa/sounds/156500/

File `assets/small_collision_sound.wav` and `assets/oryginal_sounds/small_collision_sound.wav`

Author: juskiddink
Link: https://freesound.org/people/juskiddink/sounds/108640/