There are various special offers that you can purchase in the game.
Packs are offers permanently available for purchase. They contain gems and other resources: Vitamins, Fertilizer, Dynamite, Golden Tickets, or Snowflakes.
Tap the plus sign next to the gem counter to view packs.
Time-limited offers become available under specific conditions: when a particular event starts, after reaching a certain level, etc.
Available offers are displayed on the right side of the game screen. The timer under the offer icon indicates the time left until the offer expires: