When you start the game, it will begin by giving you a "pack". click on it to get a reward. From there on out, buy dinosaurs, battle them in the "X" thingy, and collect (from left to right on the main screen) packs, DNA, and food. Click on the food icon in the battle to increase your dino's health. Packs appear every 300 seconds. Sorry but loading doesn't let you keep your original dinos for a "challenge". Plz dont crash the save system with an invalid load code