The blocks with grey colors are fixed and can not be moved. You can always tap the hint button and see the right path to the destination. PLAY Unblock Train and have FUN now! • FEATURES: - Amazing 2D Unblock Train: slide puzzle game - Tons of epic levels. You can enjoy the game enough - No time limit. Play at your own pace - Logic puzzle games are great to train your brain - Exercise your mind with unblock train puzzles - Maze Puzzle games escape the maze and block - Hint/reset/undo buttons to help you figure out each puzzle - Unblock Train sliding puzzle is fun for all ages • GAMEPLAY: - RESTART: Tap restart button to start all over. - HINT: Tap to see the right route to the destination. - LEVEL: Tap to go back to levels menu. - GET MORE HINTS: Tap to get 3 hints when you run out of hints.