Prime Gaming June 2021 free games and bonuses were detailed by Amazon and we've got it all here for you.
Here's a list of free titles that Prime Gaming (formerly Twitch Prime) subscribers can grab over June 2021:
BFF or Die
Lost in Harmony
I want to say it's one to one, but in all honesty I'm a bit fuzzy there. I can recommend JoyFreak's sister site AdminIntel - Admin & Webmaster Resource where there are lots for people of varying degrees of expertise with development, you likely can get a far more precise answer there!