To use this Fisher - Price Thomas & Friends Color - Changing Engine Kana, simply push it along like a regular toy train to recreate railway stories. For the color - changing fun, put the engine in water. You can change the water temperature to reveal hidden decorations. Remember, each engine is sold separately, so availability might vary. After playing, dry the engine thoroughly to keep it in good condition. Avoid using hot water that could damage the engine. Have fun playing with your color - changing train engine!