diff --git a/src/gui/game/GameController.cpp b/src/gui/game/GameController.cpp
index 299b2e7b7..351ffb9de 100644
--- a/src/gui/game/GameController.cpp
+++ b/src/gui/game/GameController.cpp
@@ -442,7 +442,7 @@ static Rect<int> SaneSaveRect(Vec2<int> point1, Vec2<int> point2)
 	auto tly = std::min(point1.Y, point2.Y);
 	auto brx = std::max(point1.X, point2.X);
 	auto bry = std::max(point1.Y, point2.Y);
-	return RectBetween(Vec2{ tlx, tly } / CELL, Vec2{ brx, bry } / CELL);
+	return RectBetween(Vec2{ tlx, tly }, Vec2{ brx, bry });
 }
 
 ByteString GameController::StampRegion(ui::Point point1, ui::Point point2)
@@ -1146,7 +1146,7 @@ void GameController::OpenSearch(String searchText)
 void GameController::OpenLocalSaveWindow(bool asCurrent)
 {
 	Simulation * sim = gameModel->GetSimulation();
-	auto gameSave = sim->Save(gameModel->GetIncludePressure() != gameView->ShiftBehaviour(), CELLS.OriginRect());
+	auto gameSave = sim->Save(gameModel->GetIncludePressure() != gameView->ShiftBehaviour(), RES.OriginRect());
 	if(!gameSave)
 	{
 		new ErrorMessage("Error", "Unable to build save.");
@@ -1357,7 +1357,7 @@ void GameController::OpenSaveWindow()
 	if(gameModel->GetUser().UserID)
 	{
 		Simulation * sim = gameModel->GetSimulation();
-		auto gameSave = sim->Save(gameModel->GetIncludePressure() != gameView->ShiftBehaviour(), CELLS.OriginRect());
+		auto gameSave = sim->Save(gameModel->GetIncludePressure() != gameView->ShiftBehaviour(), RES.OriginRect());
 		if(!gameSave)
 		{
 			new ErrorMessage("Error", "Unable to build save.");
@@ -1399,7 +1399,7 @@ void GameController::SaveAsCurrent()
 	if(gameModel->GetSave() && gameModel->GetUser().UserID && gameModel->GetUser().Username == gameModel->GetSave()->GetUserName())
 	{
 		Simulation * sim = gameModel->GetSimulation();
-		auto gameSave = sim->Save(gameModel->GetIncludePressure() != gameView->ShiftBehaviour(), CELLS.OriginRect());
+		auto gameSave = sim->Save(gameModel->GetIncludePressure() != gameView->ShiftBehaviour(), RES.OriginRect());
 		if(!gameSave)
 		{
 			new ErrorMessage("Error", "Unable to build save.");
diff --git a/src/simulation/Simulation.cpp b/src/simulation/Simulation.cpp
index 117d725e7..4053c6e88 100644
--- a/src/simulation/Simulation.cpp
+++ b/src/simulation/Simulation.cpp
@@ -19,7 +19,7 @@ extern int Element_LOLZ_lolz[XRES/9][YRES/9];
 extern int Element_LOVE_RuleTable[9][9];
 extern int Element_LOVE_love[XRES/9][YRES/9];
 
-void Simulation::Load(const GameSave *originalSave, bool includePressure, Vec2<int> blockP)
+void Simulation::Load(const GameSave *originalSave, bool includePressure, Vec2<int> blockP) // block coordinates
 {
 	auto save = std::unique_ptr<GameSave>(new GameSave(*originalSave));
 
@@ -335,10 +335,10 @@ void Simulation::Load(const GameSave *originalSave, bool includePressure, Vec2<i
 	}
 }
 
-std::unique_ptr<GameSave> Simulation::Save(bool includePressure, Rect<int> blockR)
+std::unique_ptr<GameSave> Simulation::Save(bool includePressure, Rect<int> partR) // particle coordinates
 {
+	auto blockR = RectBetween(partR.TopLeft / CELL, partR.BottomRight / CELL);
 	auto blockP = blockR.TopLeft;
-	auto partR = RectSized(blockR.TopLeft * CELL, blockR.Size() * CELL);
 
 	auto newSave = std::make_unique<GameSave>(blockR.Size());
 	auto &possiblyCarriesType = Particle::PossiblyCarriesType();
diff --git a/src/simulation/Simulation.h b/src/simulation/Simulation.h
index 57632d8b9..f274d36cc 100644
--- a/src/simulation/Simulation.h
+++ b/src/simulation/Simulation.h
@@ -121,8 +121,8 @@ public:
 	uint64_t frameCount;
 	bool ensureDeterminism;
 
-	void Load(const GameSave *save, bool includePressure, Vec2<int> blockP);
-	std::unique_ptr<GameSave> Save(bool includePressure, Rect<int> blockR);
+	void Load(const GameSave *save, bool includePressure, Vec2<int> blockP); // block coordinates
+	std::unique_ptr<GameSave> Save(bool includePressure, Rect<int> partR); // particle coordinates
 	void SaveSimOptions(GameSave &gameSave);
 	SimulationSample GetSample(int x, int y);