Credits

Credits are in-game currency which can be used to buy items. You can get credits by leveling up.

Using credits
Credits are a usable currency. You can spend them on:
 * Boosters (helpful through the gameplay)
 * Extra Time (if your time runs out)
 * Artifacts (Useful to get XP, faster leveling up)
 * Snacks (in case you're out of energy)
 * Items (to complete quests immediately, does not affect on recipes)

Earning credits
You can also get by:
 * Leveling up (rewards you 3 credits + 3 per level and so on)
 * Completing invitation quests (gives you a gift and XP)
 * Visit 5 days in a row.
 * Earning achievements.
 * Purchasing credits (at a range of 10-600).

Prices
Prices can be at:
 * 10 for 0.99 USD
 * 50 for 2.99 USD
 * 110 for 4.99 USD
 * 230 for 9.99 USD
 * 600 for 16.99 USD