Thanks for your inputs guys but
Thanks for the comments guys.
"Sandbox" is a thing in tech where you can mess around, explore and test software. For example, some platforms have sandbox versions where you can try things out.
Open-world games are also called sandbox-games.
I think the key here is the soon-to-explode sim/360/vr business. Plus the fact that sandbox games are becoming more and more popular. This is also the categories where i imagine the end users would find interest.
Here are some sales (not trying to prove a point, just info),
urbansandbox.com 3,000 USD 2012-07-30 Afternic
sandbox.net 2,000 USD 2012-03-26 NameJet
sandbox-game.com 799 USD 2015-09-30 Sedo
cwsandbox.org 501 USD 2014-07-12 GoDaddy
sandboxcolumbus.com 116 USD 2013-01-10 GoDaddy
sandboxsports.com 110 USD 2015-03-20 GoDaddy