The 2020 edition of a-cho's Great Stream Festival was held from November 21-22nd, 2020. The idea for this festival was for players to play a game that is not one they are most familiar with.
| Player | Game and Mode | Score | Comments | Date Played |
| Cyan | Rolling Gunner - Original RF-42RS Super STORK | 1,525,240,350  | a-cho Great Stream Festival Day 1. With commentary in Japanese. | 2020-11-21 |
| ISH | Armed Police Batrider - Advanced Course D.D. | 8,877,560 | a-cho Great Stream Festival Day 2. With commentary in Japanese. (A type) | 2020-11-22 |
| daifuku | Armed Police Batrider - Advanced Course Flying Baron | 9,333,910 | a-cho Great Stream Festival Day 2. With commentary in Japanese. (C type) | 2020-11-22 |
| gan_mag_bbh | Dodonpachi - Arcade Mode C Shot | 88,416,550 | a-cho Great Stream Festival Day 2; run 2 of 2. With commentary in Japanese. | 2020-11-21 |
| gan_mag_bbh | Dodonpachi - Arcade Mode C Shot | 47,962,180 | a-cho Great Stream Festival Day 2; run 1 of 2. With commentary in Japanese. | 2020-11-22 |
| Tesu | Raiden DX - Arcade - Expert 2P | 7,896,240 | a-cho Great Stream Festival Day 1. Commentary in Japanese. | 2020-11-21 |
| Sairyo | Dodonpachi Daifukkatsu Ver.... - Arcade - Ura Loop B Strong | 62,942,367,171 | a-cho Great Stream Festival Day 1. No-miss attempt; 1 death on final pattern. Commentary in Japanese | 2020-11-21 |
| GOTYO | Dangun Feveron - Arcade Type B Roll | 6,502,076 | a-cho Great Stream Festival Day 1; run 2 of 2. With commentary in Japanese. | 2020-11-21 |
| GOTYO | Dangun Feveron - Arcade Type B Roll | 7,397,566 | a-cho Great Stream Festival Day 1; run 1 of 2. With commentary in Japanese. | 2020-11-21 |