diff --git a/terrainrenderer.go b/terrainrenderer.go
index ca68a3a..3be78df 100644
--- a/terrainrenderer.go
+++ b/terrainrenderer.go
@@ -51,25 +51,34 @@ func (r *terrainRenderer) Init(ctx *Context) error {
 	return nil
 }
 
+func isControlKeyDown() bool {
+	state := sdl.GetKeyboardState()
+	return state[sdl.SCANCODE_LCTRL] == 1 || state[sdl.SCANCODE_RCTRL] == 1
+}
+
 func (r *terrainRenderer) Handle(ctx *Context, event sdl.Event) {
 	switch e := event.(type) {
 	case *sdl.MouseButtonEvent:
 		if r.project.windowInteractRect.IsPointInside(e.X, e.Y) {
-			switch e.Button {
-			case sdl.BUTTON_LEFT:
-				down := e.Type == sdl.MOUSEBUTTONDOWN
-				if down && !r.drag.IsDragging() {
-					r.drag.Start(Pt(e.X, e.Y))
-				} else if !down && r.drag.IsDragging() {
-					r.drag.Cancel()
+			if e.Type == sdl.MOUSEBUTTONDOWN {
+				if e.Button == sdl.BUTTON_MIDDLE || (e.Button == sdl.BUTTON_LEFT && isControlKeyDown()) {
+					if !r.drag.IsDragging() {
+						r.drag.Start(Pt(e.X, e.Y))
+					}
 				}
-				if e.Type == sdl.MOUSEBUTTONUP && !r.drag.HasDragged() {
+				if e.Button == sdl.BUTTON_LEFT {
 					pos := r.project.screenToMapInt(e.X, e.Y)
 					r.game.UserClickedTile(pos)
 				}
-			case sdl.BUTTON_RIGHT:
-				if e.Type == sdl.MOUSEBUTTONDOWN {
-					r.game.CancelTool()
+				if e.Button == sdl.BUTTON_RIGHT {
+					if e.Type == sdl.MOUSEBUTTONDOWN {
+						r.game.CancelTool()
+					}
+				}
+			}
+			if e.Type == sdl.MOUSEBUTTONUP {
+				if r.drag.IsDragging() {
+					r.drag.Cancel()
 				}
 			}
 		}