Hi, these are my favorite SAO game songs. All are non-vocal in-game OSTs:
Jotaku, Anime Game Gamer
I. Eternal Return Korea Diamond Tier
II. Super Mecha Champions NA Legendary Tier
III. Tokyo Ghoul: re Call to Exist NA Top #2
IV. Fate/EXTELLA Link: NA Top #9
V. Senran Kagura PEACH BEACH SPLASH: NA Top #3
I. Eternal Return Korea Diamond Tier
II. Super Mecha Champions NA Legendary Tier
III. Tokyo Ghoul: re Call to Exist NA Top #2
IV. Fate/EXTELLA Link: NA Top #9
V. Senran Kagura PEACH BEACH SPLASH: NA Top #3