First of all, I am pretty new here, and while I did read the stickied posts, I may have missed something, so if I did something wrong, please tell me so that I do not do it again! Now down to buisness...
This is a completely separate gamemode from the regular Clash of Clans gamemode... it basically allows you to test out troops, defenses, spells, and all that stuff without danger of losing trophies and whatnot.
Basically you have a regular empty field that you can place buildings on (defenses, storages, etc.) to your desires. You unlock buildings as you get them in the regular game... for example, you can only use a Level 6 Cannon in Sandbox mode if you've upgraded a Level 6 Cannon in regular gameplay. Restrictions for the amount of one building you can place still apply. And then, you can deploy troops and spells at whatever level you choose (only troops, spells, and levels you've unlocked in regular gameplay, just like defenses) at the village and watch to see what happens. Placement of defenses is just like in edit mode, and placement of spells and troops is just like when you attack somebody.
For other experimental tools, you can use whatever level of buildings and troops you like, as long as it isn't over the highest level you have in the regular gamemode, like I said earlier... you could also grow rocks, trees, and stuff.
Finally, I think this should be unlocked at Town Hall Level 4, just like with edit mode.
I personally thought this was a great idea, I'd like you people to tell me what you think, because personally I'd love to see this implemented.

