There are different types of fish rarity in the game. Each is represented by a specific lure color:

• Grey: Common – these fish can be upgraded up to level 12
• Blue: Rare – these can be upgraded up to level 11
• Green: Epic – these fish can be upgraded up to level 9
• Purple: Mythical – these can be upgraded up to level 8
• Gold: Legendary – currently the rarest lure in the game. These fish can be upgraded up to level 6

Each rarity type has a different upgrade price. The chance to find them in packs also differs.

Once you have upgraded a lure to its maximum level, you can sell the same type of lures should you get more from future packs.