Chrome's dinosaur game has quite simple gameplay, you control a small dinosaur overcoming cactus bushes along the way. You will use the "Space" key to jump (and start the game) and the "down" key (down arrow key) to let the dinosaur down and run. To celebrate the dinosaur's fourth birthday, Google posted an interview with the programmers who developed the game and explained its origins. Why dinosaurs? According to Chrome designer Sebastien Gabriel, it's a scenario where you're transported back to "prehistoric" times before Wi-Fi became popular.