Download link, credits and description:
https://arcforged.itch.io/sonic-smackdown
Timestamps:
0:00 Sonic
1:17 Knuckles
1:44 Tails
2:34 Shadow
3:44 Omega
4:16 Rouge
4:45 Amy Rose
5:15 Big
6:15 Cream & Cheese
6:59 Blaze
7:42 Silver
8:11 Mighty
8:53 Vector
9:23 Espio
9:54 Mecha Sonic
11:15 Metal Sonic
11:50 Dr. Eggman
12:32 Chaos Zero
13:11 Emerl
14:18 Adelaida Graciela
14:57 Spirit of the Fist
15:06 Maestro Balan