Add the location of places blocks into a variable list.
At the restarting just loop that variable list and set the block at loop-location to air.

 

Can you show me an example code?

 

Code (Skript):

1. on place:
2.     set {Arena::%Location of event-block%} to block-type
3.  
4. command /loop:
5.     trigger:
6.         loop {Arena::*}
7.             set block at loop-index to loop-value
8.  

 

Thanks

 

Couldn't of asked for a more inefficient system if i tried, thanks

 

I get 2 errors -.-

'block-type' is not an entity type (Arena.sk, line 667: set {Arena::%Location of event-block%} to block-type')
[10:51:21 ERROR]: 'block' is not a text (Arena.sk, line 672: set block at loop-index to loop-value')

 

Use: type of event-block & location of loop-block

 

Not working.
I don't wanna sound rude, but can you send a code that you tested and is work?

 

Thanks!!!!! I'm now gonna try to understand it, Probably not gonna go well xD

 

Here you go!
It's not too difficult to understand.

You just add locations of placed blocks into a variable list.
The command just loop those locations and set the block to air.