Numbered Socks!

This is part of the sock pop something studio. They have a patreon I think and they make games.
And have something likes seasons. So it is the number of the season and their logo.

That is part of the image for the game on Steam. The dev Sokpop has some kind of seasons for there game releases and that number indicates what season the game is from. I'm not exactly sure how it works, but here is a response from the dev about it. It sounds like you can buy the games individually or buy each season as a collection and get a discount.

Ah, ok, cool!
Thanks both for your answers, and I hope you have a good Xmas season! ^_^