I think there should be Egg Drop Quests which tell your objective for that area. For example Stage 1 Gather 200 gems (Silver medal Award), 500 gems(Bronze Medal Award), 1000 Gems(Gold Medal Award). Each medal should contain a carton of eggs to use when your running low of eggs. For example Silver Medal gives you 10 Normal eggs, Bronze Medal contains 5 Invincible egg, and Gold Medal gives you 1 Laser Guided egg. These amounts can be given each week permanently(till player reaches the final stage of the game). Just a thought.