First you must collect the 8 Mission Shells scattered around the map to unlock each of the 8 Basic Missions. If you die then any incomplete mission progress will be reset, so you have to finish any given mission within one life. All completed missions and shells found will remain though.
I suggest saving 2,000 coins to buy the map. You can scroll and zoom in and out on the map. Exploring this a little will familiarize you with the area. Some places are too deep or dangerous for your first shark, and the shells will not be hidden in areas not intended for you to reach. Buying the map allows you to purchase the Treasure and Mission maps, but they cost 130 and 60 gems. Treasures (Sunken Objects) are in the same place in every level and are marked on my maps with a T.
Once you eat enough, your shark will gain a level, and once you reach the maximum level, you can purchase the next shark. They are expensive to unlock, so I'd suggest saving your coins for that. I only purchased a few of the cheaper +5% Points items to help with the Super Missions.
After completing the first 8 missions, you unlock Super Mission 1, which is to score over 25,000 points. Just keep eating fish, crabs, people, and birds. Stay alive and avoid mines, jellyfish, stingrays, and the striped lionfish. You will encounter less dangerous creatures if you stay close to the beginning, but you will not find as many high-scoring fish. When you fill your gold meter, Gold Rush activates and turns all creatures golden, plus you are invulnerable and can eat almost anything. Just keep at it and you will reach 25,000. Keep in mind that when you activate the Super Mission you need 25,000 more points than you currently have. So you may have to reach a higher score than 25,000 before completing the mission.
Be careful, as this game seems to crash occasionally on my Lumia 822. Especially when pressing the map, pause, or mission buttons. If this happens you will lose any progress made during that round. So you may want to die immediately after finding a shell or completing a mission. Losing the round will save your progress and you can continue on the next round.
Reef Shark Missions:
1-1 Eat 50 Tropical Fish
1-2 Swim 500M
1-3 Eat 3 People
1-4 Eat 5 Pelicans
1-5 Jump 3M Out Of Water (Use Boost)
1-6 Eat 4 Turtles
1-7 Survive For 4 Minutes
1-8 Eat 3 Beach Bystanders
1-9 Score Over 25,000 Points
Mission & Treasure Map 1:
some missions may be found at multiple locations. i ran into other shells that disappeared once i collected all the 8 shown on this map.
more game tips at: http://www.urgametips.com/2013/04/hungry-shark-evolution-faq...