Play Unblock That sliding puzzle online for free! This unblock puzzle has become a global hit. Now you can play this unblock puzzle free online on our gaming portal. Move wooden blocks to clear the way for the red one. Though the premise of this logic game is nothing new, its polished design definitely wins over. Challenge your mind and solve the puzzle in as few moves as possible to get 3 stars for the level. Prove a brainiac over a classic tabletop wooden puzzle brought to your PC or mobile device.