It's hard to define how unpopular a game must be to be considered hidden gem. I went with games with less than 3k Steam reviews. You can check out all hidden gems here - gamebundleguardian.com/games/hidden-gems.
What are your favorites?
I'm building a website that tracks game bundles, but instead of hyping up the savings compared to full Steam price, it gives you all the info you need to decide that the bundle is not worth it. I'm scoring bundles based on game quality and year low price of the games.
Other than browsing bundles, you can also explore bundled games by genre, here are all FPS games available - https://gamebundleguardian.com/games/fps
Did you find any good FPS deals in bundles?
I'm running a game bundle tracking site and I noticed that there are quite a few great base building games currently available. Some of the top rated ones are:
I've created a filter so that you can easily explore all games - gamebundleguardian.com/games/base-building. What's the best base building game you've picked up in a bundle?