track bombs exploded

src/Mailbomb.sol

@@ -10,6 +10,7 @@ contract Mailbomb is ERC1155, Owned {
     using LibString for uint256;
 
     uint256 public bombsAssembled;
+    uint256 public bombsExploded;
     string public baseURI;
     Main public main;
 
@@ -57,6 +58,7 @@ contract Mailbomb is ERC1155, Owned {
 
     /// Burn spent tokens from main contract
     function explode(address _from, uint256 _amount) external onlyMain {
+        bombsExploded += _amount;
         super._burn(_from, 1, _amount);
     }
 

src/Main.sol

@@ -143,6 +143,11 @@ contract Main is Owned {
         return mailbomb.bombsAssembled();
     }
 
+    /// Get BOMB exploded amount
+    function bombsExploded() public view returns (uint256) {
+        return mailbomb.bombsExploded();
+    }
+
     // =========================================================================
     //                              Tokens
     // =========================================================================