diff --git a/Board.cpp b/Board.cpp
index f1e3bea..870864a 100644
--- a/Board.cpp
+++ b/Board.cpp
@@ -12,11 +12,6 @@ Board::Board(vi2d boardSize,float gravity,float maxGravity,float launchSpd,float
     for (int i=0;i<boardSize.x;i++) {
         cols.push_back(std::vector<Block>());
     }
-    cols[3].push_back({{3*12,6*12},BlockColor::RED});
-    cols[4].push_back({{4*12,8*12},BlockColor::RED});
-    cols[4].push_back({{4*12,7*12},BlockColor::RED});
-    cols[4].push_back({{4*12,6*12},BlockColor::RED});
-    cols[5].push_back({{5*12,6*12},BlockColor::RED});
 }
 
 void Board::spawnBlock(int col){
@@ -113,4 +108,12 @@ void Board::removeBlock(int col,int ind){
 
 void Board::assignRandomColor(Block&b){
     b.col=colorHandler.getRandomColor();
+}
+
+Block&Board::getBlock(SelectedBlockData&blockData){
+    if (blockData.c!=-1){
+        return clumps[blockData.c].getBlocks()[blockData.ind];
+    } else {
+        return cols[blockData.col][blockData.ind];
+    }
 }
\ No newline at end of file
diff --git a/Board.h b/Board.h
index a2f9e26..1c13602 100644
--- a/Board.h
+++ b/Board.h
@@ -28,6 +28,12 @@ class ColorDistributor{
     BlockColor getRandomColor();
 };
 
+struct SelectedBlockData{
+    int col=-1;
+    int ind=-1;
+    int c=-1;
+};
+
 class Board{
     std::vector<std::vector<Block>> cols;
     std::vector<BlockClump> clumps;
@@ -43,6 +49,7 @@ class Board{
     float launchSpd;
     float launchTime; //How much time a stack rises before beginning descent.
     float landTime;
+    SelectedBlockData selectedBlock;
     Board();
     Board(vi2d boardSize,float gravity,float maxGravity,float launchSpd,float launchTime,float landTime,float spawnRate,std::array<int,10> colorRates,Renderable&tileset);
     void spawnBlock(int col);
@@ -53,5 +60,6 @@ class Board{
     void removeClump(int ind);
     void removeBlock(int col,int ind);
     void assignRandomColor(Block&b);
+    Block&getBlock(SelectedBlockData&blockData);
 };
 #endif
\ No newline at end of file
diff --git a/C++ProjectTemplate b/C++ProjectTemplate
index b0d9755..d43b418 100755
Binary files a/C++ProjectTemplate and b/C++ProjectTemplate differ
diff --git a/main.cpp b/main.cpp
index b19aeee..a90d968 100644
--- a/main.cpp
+++ b/main.cpp
@@ -19,11 +19,11 @@ bool Meteos::OnUserCreate()
 	SPRITES["blocks_test.png"].Load("assets/blocks_test.png");
 
 	std::random_device rd;  //Will be used to obtain a seed for the random number engine
-    gen=std::mt19937(0); //Standard mersenne_twister_engine seeded with rd()
+    gen=std::mt19937(rd()); //Standard mersenne_twister_engine seeded with rd()
     randBlockPos=std::uniform_int_distribution<>(0, 9);
     coinFlip=std::uniform_int_distribution<>(0, 1);
 
-	gameBoard=Board({10,14},0.04f,1.2f,-1.f,1.7f,2.0f,1.0f,{3,3,0,0,0,0,0,0,0,0},SPRITES["blocks_test.png"]);
+	gameBoard=Board({10,14},0.04f,1.2f,-1.f,1.7f,2.0f,1.0f,{3,3,1,2,3,0,0,0,0,0},SPRITES["blocks_test.png"]);
 
 	return true;
 }
@@ -418,25 +418,23 @@ void Meteos::updateGame(float fElapsedTime){
 		bool firstBlock=true;
 		int baseBlockPos;
 		for (BlockMatchingInfo&info:matchedBlockIDs) {
-			Block*b;
 			if (info.c!=-1){
-				b=&gameBoard.getBlockClumps()[info.c].getBlocks()[info.ind];
+				Block&b=gameBoard.getBlockClumps()[info.c].getBlocks()[info.ind];
 				if (firstBlock) {
-					baseBlockPos=gameBoard.getBlockClumps()[info.c].getBlockPosition(*b).y;
+					baseBlockPos=gameBoard.getBlockClumps()[info.c].getBlockPosition(b).y;
 					c.y=baseBlockPos-1;
 					firstBlock=false;
 				}
+				b.col=BlockColor::LAUNCHED;
 			} else {
-				b=&gameBoard.getBlocks(info.col)[info.ind];
+				Block&b=gameBoard.getBlocks(info.col)[info.ind];
 				if (firstBlock) {
-					baseBlockPos=b->pos.y;
+					baseBlockPos=b.pos.y;
 					c.y=baseBlockPos-1;
 					firstBlock=false;
 				}
+				b.col=BlockColor::LAUNCHED;
 			}
-			b->col=BlockColor::LAUNCHED;
-			c.vspeed=gameBoard.launchSpd;
-			c.launchTime=gameBoard.launchTime;
 		}
 		for (BlockMatchingInfo&info:matchedBlockIDs) {
 			if (info.c!=-1){
@@ -458,11 +456,14 @@ void Meteos::updateGame(float fElapsedTime){
 			}
 		}
 		gameBoard.addClump(c);
+		gameBoard.getBlockClumps()[gameBoard.getBlockClumps().size()-1].vspeed=gameBoard.launchSpd;
+		gameBoard.getBlockClumps()[gameBoard.getBlockClumps().size()-1].launchTime=gameBoard.launchTime;
 	}
 	for (int i=0;i<gameBoard.getBlockClumps().size();i++){ //Resolve BlockClump movements.
 		BlockClump&c=gameBoard.getBlockClumps()[i];
 		for (int j=0;j<c.getBlocks().size();j++){
 			Block&b=c.getBlocks()[j];
+			b.addedToLaunchList=false;
 			if (c.vspeed<0&&c.getBlockPosition(b).y<0||b.markedForRemoval){
 				c.removeBlock(j--);
 				break;
@@ -484,6 +485,78 @@ void Meteos::updateGame(float fElapsedTime){
 			b.addedToLaunchList=false;
 		}
 	}
+	//Invalidate the selected block if something is strange about it.
+	if (gameBoard.selectedBlock.col!=-1){
+		if (gameBoard.selectedBlock.c!=-1){
+			if (!(gameBoard.selectedBlock.c<gameBoard.getBlockClumps().size()&&gameBoard.selectedBlock.ind<gameBoard.getBlockClumps()[gameBoard.selectedBlock.c].getBlocks().size()&&gameBoard.getBlockClumps()[gameBoard.selectedBlock.c].getBlocks()[gameBoard.selectedBlock.ind].pos.x/12==gameBoard.selectedBlock.col)){
+				gameBoard.selectedBlock={-1};
+				goto invalidatedExit;
+			}
+		} else {
+			if (!(gameBoard.selectedBlock.ind<gameBoard.getBlocks(gameBoard.selectedBlock.col).size())){
+				gameBoard.selectedBlock={-1};
+				goto invalidatedExit;
+			}
+		}
+	}
+	invalidatedExit:
+	if (GetMouse(0).bHeld){
+		int mouseX=(GetMouseX()-gameBoard.drawOffset.x);
+		int mouseY=(GetMouseY()-gameBoard.drawOffset.y);
+		int mouseCol=mouseX/12;
+		int mouseRow=mouseY/12;
+		if (mouseCol>=0&&mouseCol<gameBoard.boardSize.x) {
+			for (int y=0;y<gameBoard.getBlocks(mouseCol).size();y++){
+				Block&b=gameBoard.getBlocks(mouseCol)[y];
+				if (b.pos.y/12==mouseRow){
+					SelectedBlockData newData={mouseCol,y,-1};
+					if (gameBoard.selectedBlock.col!=-1&&mouseCol==gameBoard.selectedBlock.col){
+						//See if these two can be swapped.
+						Block&b1=gameBoard.getBlock(gameBoard.selectedBlock);
+						Block&b2=gameBoard.getBlock(newData);
+						int y1=(gameBoard.selectedBlock.c!=-1)?gameBoard.getBlockClumps()[gameBoard.selectedBlock.c].getBlockPosition(gameBoard.getBlockClumps()[gameBoard.selectedBlock.c].getBlocks()[gameBoard.selectedBlock.ind]).y:gameBoard.getBlocks(gameBoard.selectedBlock.col)[gameBoard.selectedBlock.ind].pos.y;
+						int y2=(newData.c!=-1)?gameBoard.getBlockClumps()[newData.c].getBlockPosition(gameBoard.getBlockClumps()[newData.c].getBlocks()[newData.ind]).y:gameBoard.getBlocks(newData.col)[newData.ind].pos.y;
+						if (b1.pos.x==b2.pos.x&&std::abs(y1-y2)<=12){
+							//Swap the two!
+							BlockColor tempCol=b1.col;
+							b1.col=b2.col;
+							b2.col=tempCol;
+						}
+					}
+					gameBoard.selectedBlock=newData;
+					goto found;
+				}
+			}
+			for (int i=0;i<gameBoard.getBlockClumps().size();i++){
+				BlockClump&c=gameBoard.getBlockClumps()[i];
+				for (int j=0;j<c.getBlocks().size();j++){
+					Block&b=c.getBlocks()[j];
+					if (b.pos.x/12==mouseCol&&c.getBlockPosition(b).y<=mouseY&&c.getBlockPosition(b).y+12>=mouseY){
+						SelectedBlockData newData={mouseCol,j,i};
+						if (gameBoard.selectedBlock.col!=-1&&mouseCol==gameBoard.selectedBlock.col){
+							//See if these two can be swapped.
+							Block&b1=gameBoard.getBlock(gameBoard.selectedBlock);
+							Block&b2=gameBoard.getBlock(newData);
+							int y1=(gameBoard.selectedBlock.c!=-1)?gameBoard.getBlockClumps()[gameBoard.selectedBlock.c].getBlockPosition(gameBoard.getBlockClumps()[gameBoard.selectedBlock.c].getBlocks()[gameBoard.selectedBlock.ind]).y:gameBoard.getBlocks(gameBoard.selectedBlock.col)[gameBoard.selectedBlock.ind].pos.y;
+							int y2=(newData.c!=-1)?gameBoard.getBlockClumps()[newData.c].getBlockPosition(gameBoard.getBlockClumps()[newData.c].getBlocks()[newData.ind]).y:gameBoard.getBlocks(newData.col)[newData.ind].pos.y;
+							if (b1.pos.x==b2.pos.x&&std::abs(y1-y2)<=12){
+								//Swap the two!
+								BlockColor tempCol=b1.col;
+								b1.col=b2.col;
+								b2.col=tempCol;
+							}
+						}
+						gameBoard.selectedBlock=newData;
+						goto found;
+					}
+				}
+			}
+			found:;
+		}
+	}
+	if (GetMouse(0).bReleased){
+		gameBoard.selectedBlock={-1};
+	}
 }
 
 void Meteos::drawGame(float fElapsedTime){
@@ -501,13 +574,13 @@ void Meteos::drawGame(float fElapsedTime){
 		BlockClump&c=gameBoard.getBlockClumps()[i];
 		for (int j=0;j<c.getBlocks().size();j++){
 			Block&b=c.getBlocks()[j];
-			DrawPartialDecal(c.getBlockPosition(b)+gameBoard.drawOffset,gameBoard.tileset,{(float)(int)b.col*12,0},{12,12});
+			DrawPartialDecal(c.getBlockPosition(b)+gameBoard.drawOffset,gameBoard.tileset,{(float)(int)b.col*12,0},{12,12},{1,1},gameBoard.selectedBlock.col!=-1&&gameBoard.selectedBlock.ind==j&&gameBoard.selectedBlock.c==i?GREY:WHITE);
 		}
 	}
 	for (int i=0;i<gameBoard.boardSize.x;i++){
 		for (int y=0;y<gameBoard.getBlocks(i).size();y++){
 			Block&b=gameBoard.getBlocks(i)[y];
-			DrawPartialDecal(b.pos+gameBoard.drawOffset,gameBoard.tileset,{(float)(int)b.col*12,0},{12,12});
+			DrawPartialDecal(b.pos+gameBoard.drawOffset,gameBoard.tileset,{(float)(int)b.col*12,0},{12,12},{1,1},gameBoard.selectedBlock.col!=-1&&gameBoard.selectedBlock.c==-1&&gameBoard.selectedBlock.col==i&&gameBoard.selectedBlock.ind==y?GREY:WHITE);
 		}
 	}
 }