If your talking about minecraft, then yes, I have it and it is 100% legal. :)
Just don't spawn so much stuff into the game that it gets boring.
No
i have invedit but my computer keeps saying its a Malware program, but its really helpful. So i recommend downloading it :)
Yes it is.
Anything you want.
I don't think you can I'm not sure but I'm pretty sure they would have a download link to an updated INVedit
Almost certainly no.
Search "Terraria invedit" on youtube.
Invedit. An Inventory editor.
Yes. you can use INVEdit.
open up Invedit, select "open from" and chose the world you want to invedit, and search for items you want and drag them into your inventory (the boxes). then click save to world # (whatever you want)
You can always use an inventory editor. I use INVedit
Download it from from the Minecraft forum. The link is under "Sources and related links" below this answer.