Idea New Minigame- Hidden Bombs

As always, I'm not sure if this idea will be possible to code, but here goes.

I'm not sure what kind of map would be good for this gamemode, but definitely not too small. I think a map about the size of the War map 'Nuketown' or slightly smaller. Lots of detail would be good, not too many open spaces.

Everybody starts with a single piece of TNT. The game starts and you have twenty seconds to place it. It disappears after two seconds and players can then walk through it like its not there. After twenty seconds, all the TNT explodes and anyone within a radius of five blocks is out. The next round each player gets two TNT. Then four. Then eight. Et cetera. The game ends after six rounds i.e. two minutes or when there is only one person standing. Multiple winners will share the coins. There could be a coin bonus of perhaps 2 coins for each player you explode.

Purchasable items (could be donor):

Death Radius: Your TNT has a radius of two blocks more.
Instant Invisibility: Your TNT turns invisible as soon as you place it, as opposed to after two seconds, like normally. This makes it harder for players to know where your TNT is.


Skills that would help you win:

Knowledge of the map: If there is a place you think a lot people will go to, you can put TNT there and get more people out.
Timing: in the later rounds when you have 16+ TNT, you must know when to stop placing and start getting to a place you don't think anyone has put TNT in.