You have to continue to level up and advance. Collect all the free chests and crown chests that you can.
You need to find the fighting style that best works for you, then build a card deck to match it.
Find combos of cards that will strengthen each other. For instance, a giant does not defend himself, only attacks the castles. You should always drop a unit along with him that can defend him from attacks. A giant along with a witch is a good combination.
You will also need to learn which cards are strong or weak against other cards. For instance, a valkyrie will wipe out a skeleton army. You would want to use the valkyrie to defend against a skeleton army, but you would not want to put down a skeleton army to fight against a valkyrie. You would want to use something that can fight her from a distance, like a musketeer.
Balance your card deck. Try to get a maximum effect for minimum elixir. You wouldn't want all heavy hitters (tanks). You will need some cards that you can put down quickly in case you are being attacked. You will want at least one or two cards that are able to hit flying units. If you only have ground attacking units, one air unit (like a balloon) will do you serious damage. You also want a distance card or two. Fireballs are a good option. These will help you wipe out enemy huts.
Yes it is
eubie
There are no codes in clash of clans.
There is no "best" base in clash of clans.
No, Clash of Clans is not available for Nook.
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No, you must have an internet connection to play Clash of Clans.
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No, Clash of Clans has not yet been made for the Kindle.
YEs, you can donate spells in Clash of Clans
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The company by the name Supercell makes clash of clans.