It's a pack that is not reported correctly. I have every Serious Sam game on Stem, but it popped up on my list. Check the winners.
Also, I hope you know it is considered bundled on this site, as all Serious Sam content on Steam is.

I have the first one, I hope it's ok to enter for the second one.

I have both these games, but can still enter.

Yay, I don't have the HD versions. The old ones are pretty fun to play.
Thanks for the chance!

thanks !