(If playing in easy mode, it starts with just red, green, and blue. The sequence is red, green, blue, yellow, violet, white, gray. Every minute or so during gameplay, a dinosaur will announce 'Whirley's coming!', and soon after, Whirley (a purple pterodactyl) will fly across the screen carrying an egg of a color not yet on your screen.
An interesting aspect to make the game increasingly difficult as you play a single game for a longer amount of time is the inclusion of Whirley.
