diff --git a/src/jasper/modules/world/src/studio/worldeditor/worldeditor-imgui.cpp b/src/jasper/modules/world/src/studio/worldeditor/worldeditor-imgui.cpp
index ddaea9f..e4f56dc 100644
--- a/src/jasper/modules/world/src/studio/worldeditor/worldeditor-imgui.cpp
+++ b/src/jasper/modules/world/src/studio/worldeditor/worldeditor-imgui.cpp
@@ -87,6 +87,12 @@ constexpr studio::Selection fbPtToTileAddr(
 	return sel;
 }
 
+[[nodiscard]]
+constexpr bool inside(auto const val, int const min, int const max) noexcept {
+	auto const v = static_cast<int>(val);
+	return v < max && v > min;
+};
+
 WorldEditorImGui::WorldEditorImGui(studio::StudioContext &sctx, ox::StringView path):
 		Editor(path),
 		m_sctx(sctx),
@@ -245,17 +251,13 @@ void WorldEditorImGui::handleSelection(ox::Size const&paneSz, float fbPaneScale)
 	auto const&io = ImGui::GetIO();
 	if (io.MouseDown[0]) {
 		auto const fbPos = world::fbPos(ox::Vec2{io.MousePos});
-		auto constexpr inside = [](auto val, int min, int max) {
-			auto const v = static_cast<int>(val);
-			return v < max && v > min;
-		};
 		auto const startSel = io.MouseClicked[0]
 		                   && inside(fbPos.x, 0, paneSz.width)
 		                   && inside(fbPos.y, 0, paneSz.height);
-		m_selection.updateCursorPoint(fbPos, startSel);
 		auto const scaledViewSz = static_cast<ox::Vec2>(m_view.drawSize()) * fbPaneScale;
+		m_selection.updateCursorPoint(fbPtToTileAddr(fbPos, scaledViewSz), startSel);
 		if (m_selection.selectionOngoing()) {
-			m_view.setSelection(fbPtToTileAddr(m_selection.selection(), scaledViewSz));
+			m_view.setSelection(m_selection.selection());
 		}
 	} else if (io.MouseReleased[0]) {
 		m_selection.finishSelection();
@@ -273,18 +275,31 @@ ox::Error WorldEditorImGui::handleDrop(float fbPaneScale) noexcept {
 					static_cast<float>(viewSz.width) * fbPaneScale,
 					static_cast<float>(viewSz.height) * fbPaneScale});
 	if (tileAddr.x < m_doc.columns && tileAddr.y < m_doc.rows) {
+		ox::Vector<ModifyTilesCommand::Mod> mods;
+		if (tileSelected(tileAddr)) {
+			studio::iterateSelection(m_selection.selection(), [&](int32_t x, int32_t y) {
+				mods.emplace_back(ModifyTilesCommand::Mod{
+					.layer = m_activeLayer,
+					.tileAddr = {x, y},
+					.objId = objId.objId,
+					.setId = objId.setId,
+				});
+			});
+		} else {
+			mods = {
+				{
+					.layer = m_activeLayer,
+					.tileAddr = tileAddr,
+					.objId = objId.objId,
+					.setId = objId.setId,
+				},
+			};
+		}
 		std::ignore = pushCommand<ModifyTilesCommand>(
 				m_doc,
 				m_worldStatic,
 				m_objCache,
-				ox::Vector<ModifyTilesCommand::Mod>{
-					{
-						.layer = m_activeLayer,
-						.tileAddr = tileAddr,
-						.objId = objId.objId,
-						.setId = objId.setId,
-					},
-				});
+				std::move(mods));
 	}
 	oxReturnError(loadWorldStatic(m_objCache, m_doc).moveTo(m_worldStatic));
 	return ox::Error{};
@@ -322,9 +337,13 @@ ox::Error WorldEditorImGui::loadObjectSets() noexcept {
 }
 
 ox::Error WorldEditorImGui::undoStackChanged(studio::UndoCommand const*cmd) {
-	auto const clearSelection = dynamic_cast<EditWorldSizeCommand const*>(cmd) != nullptr;
 	oxReturnError(m_view.setupWorld());
 	return {};
 }
 
+bool WorldEditorImGui::tileSelected(ox::Point const&pt) const noexcept {
+	auto const sel = m_selection.selection();
+	return inside(pt.x, sel.a.x, sel.b.x) && inside(pt.y, sel.a.y, sel.b.y);
+}
+
 }
diff --git a/src/jasper/modules/world/src/studio/worldeditor/worldeditor-imgui.hpp b/src/jasper/modules/world/src/studio/worldeditor/worldeditor-imgui.hpp
index 8ddd931..b1dabbb 100644
--- a/src/jasper/modules/world/src/studio/worldeditor/worldeditor-imgui.hpp
+++ b/src/jasper/modules/world/src/studio/worldeditor/worldeditor-imgui.hpp
@@ -85,6 +85,9 @@ class WorldEditorImGui: public studio::Editor {
 		ox::Error loadObjectSets() noexcept;
 
 		ox::Error undoStackChanged(studio::UndoCommand const*);
+
+		[[nodiscard]]
+		bool tileSelected(ox::Point const&pt) const noexcept;
 };
 
 }