So, what happens is:
You buy a game, check what level (bronze, silver, gold) it has, and then you get the bonus games for that level as well.
Example: Handsome Jack Collection is $9 AUD: marked as silver: you will then ge:
- Intel® Starter Pack - 4x games
- 1x Silver Gift*
- 10% sale-wide voucher
It is actually explained on the website.
A list of the free games available to pick from is here:
Gold: https://www.greenmangaming.com/summer-sale/free-games/gold/
Silver: https://www.greenmangaming.com/summer-sale/free-games/silver…
Bronze: https://www.greenmangaming.com/summer-sale/free-games/bronze…
Those bonus games are so bad, even the gold tier ones are regularly on sale for next to nothing.
But they're free with your purchase so can't complain.