Currencies

There are several currencies in Galaxy Attack: Alien Shooter, and each one has a specific purpose. The three primary currencies (Energy, Gold, and Crystals) are displayed in the game header, when not participating in battle.

Gold
Gold is the most common in-game currency. It is used for:
 * Unlocking some spaceships
 * Upgrading spaceships and galactic drones
 * Entering tournaments
 * PvP
 * Reviving spaceships (first time only)
 * Creating a clan
 * Using the spin
 * Donating to the clan
 * Skipping the cooldown timer for World Boss events
 * Purchasing boosters (only when you don't have any of said booster)
 * Cards

Sources of gold include:
 * Campaign
 * Winning PvP
 * Chests
 * Endless Mode
 * Boss mode
 * World Boss rewards
 * Gift codes
 * Winning gold from the spin
 * Daily quests
 * Daily reward
 * Endless mode stage rewards
 * Bonus ads

Crystals
Crystals are a from of premium currency. They are used for:
 * Unlocking higher quality spaceships (Pirate King and Terminator)
 * Purchasing chests
 * Reviving spacehips (beyond the first revive)
 * PvP
 * Cards
 * Unlocking some spaceship skins

Sources of crystals include:
 * Defeating bosses
 * Winning PvP
 * Winning crystals from the spin (only for those who have passed level 60 in the campaign)
 * Daily reward
 * Gift codes
 * Epic Chests
 * Bonus ads (10% chance, maximum 2 daily)
 * Endless mode stage rewards
 * Completing 3 or more daily quests

Energy
Energy is required to play in all modes. Players start with 100 energy points, and when below 100 energy increases one point every two minutes (see the countdown on the main title bar), though energy can increase above 100 through awards or purchases.

Energy cost of activities
 * 5 - Campaign mode, Boss mode
 * 10 - PvP
 * 15 - 15 Endless mode

Sources of energy include:
 * Accumulates to a maximum of 100 over time
 * Purchase from header: 50 Energy points for 5 Crystals, 10 Energy points for 1 Watch
 * Daily reward
 * Gift Codes
 * Winning energy from the spin

Legendary Tokens
Legendary Tokens (aka: Legendary Pieces) are one of the most highly sought after currencies because they are used to:
 * Unlock the Legendary spaceship
 * Upgrade the Legendary spaceship
 * Unlock galactic drones instead of using drone tickets
 * Upgrade galactic drones instead of using drone tickets

Legendary tokens can only be found in chests and the Matrix. They cannot be purchased.

Drone Tickets
Drone tickets are used to unlock and upgrade drones. They can be obtained by:
 * Collecting weekly quest items.
 * Purchasing them from the clan market (occasionally appear).
 * Completing the "D#" levels in Single Player Campaign Mode.

Matrix Tickets
Matrix tickets are used to spin the Matrix, which awards puzzle-pieces for Expert Items, special spaceship skins, and other boosters. They can be obtained by:
 * Participating in PvP awards one matrix ticket per day
 * Earning 1000 PvP points in a day (if CP is over 900,000)

Clan Points
Clan points are earned for various tasks after one joins a clan. Clan points are only used to rank clan members in the clan's leaderboard, and are converted to clan gold at the end of each month (stage).

Sources of clan points:

Clan Gold
Clan gold is used to purchase ship upgrade pieces through the Market (aka Clan Store).

Clan Gold can be used to:
 * Purchase Booster Item Pieces
 * Purchase certain Spaceship Skin pieces (Level 2 and "Galaxy" skins)

Evolve Stones
Evolve stones are used to upgrade ships' evolve level, adding special skills. There are 10 types of evolve stones, each corresponding to the ship of the same number.

Evolve stones are used to:
 * Evolve ship with more power
 * Upgrade full bullet level

Sources of evolve stones include:
 * Campaign, Endless, Boss, and PvP modes (rare drop)
 * World Boss rewards
 * Gift codes
 * Spin, Chests, Matrix
 * Daily quests
 * Daily reward
 * Bonus ads