If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
UFO Jigsaw is a jigsaw puzzle game that would certainly keep you at the edge of your seat. It has 4 puzzle difficulties. Expert mode is composed of 192 pieces, hard with 108, medium 48 pieces and lastly, easy with 12 pieces. Select game difficulty and click on shuffle in order for the pieces to be re-arrange. Hold the piece by holding left mouse button and drag to desired place. Complete the picture to move to the next round.