diff --git a/Tetris/ContentView.swift b/Tetris/ContentView.swift
index 335aecd..c8436f0 100644
--- a/Tetris/ContentView.swift
+++ b/Tetris/ContentView.swift
@@ -73,7 +73,8 @@ struct ContentView: View {
     func horizDragGesture(geometry: GeometryProxy) -> some Gesture {
         DragGesture(coordinateSpace: .global)
             .onChanged { (state) in
-                guard let currentPiece = self.controller.currentPiece else { return }
+                guard case .playing(.normal) = self.controller.state,
+                    let currentPiece = self.controller.currentPiece else { return }
                 if self.initialXPosition == nil {
                     self.initialXPosition = currentPiece.topLeft.0
                 }
diff --git a/TetrisKit/GameController.swift b/TetrisKit/GameController.swift
index 91e2e1c..d8d8bc8 100644
--- a/TetrisKit/GameController.swift
+++ b/TetrisKit/GameController.swift
@@ -14,7 +14,7 @@ public class GameController: ObservableObject {
     public let width = 10
     public let height = 20
     
-    var state: GameState = .waitingForStart
+    public var state: GameState = .waitingForStart
     
     @Published public var board: GameBoard
 
@@ -155,12 +155,12 @@ public class GameController: ObservableObject {
 
 }
 
-enum GameState {
+public enum GameState {
     case waitingForStart
     case playing(PlayState)
 }
 
-enum PlayState {
+public enum PlayState {
     case normal
     case dropped
     case switched