I recently unlocked the "flood" achievement in my gameroom.
It's been a process to get it back together. The machines are (mostly) back in the main area of the space, but up on end. I recently pieced together my media room, outfitted with new seats to replace my peeling old ones. While I left carpet in that space, I decided to go with a vinyl plank in the rest of the space, and install it myself.
I considered making some pretty radical changes... maybe blowing out the wall that's currently my small storage space, and where my panel and sump are located. That would have only bought me space for 2 machines, and I would have needed to find another space for storage. I have room for 6 games cleanly within my main area. I currently put a few games in my "shop" area. It's not the most cozy, but I'm having a hard time deciding on which ones to move, and it at least allows me a space to play them. I bought extra flooring to try and make that space more comfortable. I'll see how that goes before making any major decisions.
At my old place I had a golf simulator setup in the 3rd stall of my garage. Having moved last year, and the life events since then, I haven't had a chance to clear out the new space enough to set that up again.
I feel sort of bad because I was the limiting factor during our house search. I 'required' a 3 car garage for a golf sim, a space large enough for a 9' pool table, space for a collection of pinball machines (and a reasonable way to get them to that space), and a media space. It's a lot, and while I've actually checked all of those boxes, I don't have exclamation points in any of them. Adding on may be an option, but taxes here are so high that it probably makes sense to get out as soon as the kids are out of school.
Rambles. I'll get pictures of the various stages and new space once I get things a little more setup.