Moving to the Next Episode
For this episode, you will need to claim tiles (not including the initial tile marked green) to be able to move onto the next episode. You can progress without reaching the final tile (purple) that has the new dragon.
When hovering over each box you will see some of the rewards that can be gained by purchasing that box. Food and Gold rewards scale by the players level, so the actual value will be different. Buildings and some of the possible dragons are not shown yet.
Grid Islands require you to buy each box using points. These points can be coins, tokens, or whatever fits the theme of the island. To obtain these points you take actions like collecting gold from habitats, feeding your dragons, and hatching eggs.
The most important thing to know is that grid islands have a timer, and you can only collect so many points (600) during any given 8 hour time-frame. Once you've collected the max points in that time-frame, you won't get any more until you are in the next 8 hour time-frame. So pay attention to the timing and don't waste your food, eggs, or time when there's no chance of gaining points from it!
Fighting in Happy-inferno Island
When you run into encounters (those red claws) you will have to fight several dragons. Check out each dragon's info page to find the right dragons to use against them. Use the attacks with elements listed as "Attack With" to get critical hits. If your dragon has the "Avoid" elements as it's first element, you can get critical hit in return, so use different first elements. If you can critical hit them and they can't critical hit you, you will have an easy time.
The dragons you fight will have their levels based on the level of the dragon you choose. The "Bonus" is how many levels different +/- the opponent will be. So a negative number is a bonus for you, and a positive number is a bonus for the opponent. For example, if you choose a level 30 dragon and the bonus is -1, the opponent will be level 29.