When you are unable to connect to the Internet you always saw the image of dinosaur with the text “Unable to connect to the Internet“.
So here the tip whenever you saw this dinosaur or T-Rex Image, hit space to activate and to start the game or just touch the Rex if you are using your mobile phone. To jump over the cacti, again you need to press the space bar or continue tapping.
P.S: Update your Google Chrome to version 38.0 or above if you want this game