I have thought of doing this, right now I have to go up 5 steps, spin the game in a 3.5' x 3.5' area and go down 12 steps. NOT FUN!
How far down will the stairs go? Most are 3' to 5' down, obviously the more stairs the harder to move games.
A 4' landing is fine, looks like you will have 4' wide stairs also. Get a 36" door (or pay MUCH more for a custom oversized one) Or if the depth isn't too far, a set of french doors and wider stairs would look nice and make it possible to have a larger game if ever wanted.
My parents have a small(4) set of steps into the basement, (with 3x3 landing) its easy to move games in and out, but they only have a 32" door so its a bit more work to aim straight in. they have a small roof over the stairs and have had no water problems. But their house is on the top of a hill, and the builder put a large french drain in under the stairs.
My brother has a larger set of stairs(6) and I wouldn't really want to move games on his, and he has a narrow door. He had water coming in the back door, and even added a roof over them because of the water problems, he still gets some that comes up through cracks between the foundation and the stairs.
Make sure the drain does connect into the sump pump and that your existing pump can cover the added load, AND there is a backup pump. You are adding a way for water to get into your basement, and need a way to get it out. Make sure the grade slopes away from the stairs and also the house, even if it means adding another step to get the ground to slope away.
Once you get your stairs installed you can build a ramp to make it much easier, and avoid the 4" step back up into the basement. I made a set for my parents out of a 2x8x16 cut in half. I have them cut to fit tight between the 4" rise at the door, and the top step. I just set them far enough apart to be under the hand wheels and let me walk between. It would be easier if I cut a piece of plywood to fit over the boards so I didn't have to squeeze between the boards, but I rarely move a game in/out of their basement. so these work.
Ok as part of my gameroom project I will be getting outside basement stairs added to my home. It will be a straight shot of stairs. I have a question for those of you that have basement stairs: Any design items I need to take into account?
The bilder has said that there will be a landing at the bottem of the stairs roughly 4' square. There will be a drain that ties into my sump pump. And the landing will be approx 4" below the finished grade of the basement floor. I am looking at arcade related questions regarding the stairs for those that have them. Things you may have done differently or things you wished you had. And yes I did ask how much an elevator would cost.