Removing changes to world?

Hey!
I'm currently working on a PVP minigame. The map that I am using is a map built by someone else, and I want it to reset to the original version of that world when the round of a game restarts. For example:
[Round] Map loads
[Player] Player gets rid of multiple blocks
[Round] When game is over, all the broken blocks are no longer broken and the structure looks normal.
How would I do this?

 

ItsLeoFTW
Well, if it's a separate world, after the game ends you can simply unload and then reload the world using this:

Code:java

Bukkit.unloadWorld("worldName", false);
//unloads a designated world. False means that the world will not be saved

reload the world using:

Code:java

Bukkit.getServer().createWorld(new WorldCreator("worldName"));
//loads the designated world if it exists, otherwise creates a new one

If it's an arena or something that you want to rollback, then when an in-game player breaks a block, you want to store the block type and location in a HashMap and then when the game is over, iterate through the map and replace the broken blocks

Hope this helps

 

The Gaming Grunts Thanks! That's really helpful!