The Prize Wheel was eliminated in the "Biggest Update Ever" on June 25, 2014.
Previously, the Wheel could be spun to earn Gold, Silver, Cards, Headquaters items, or Crafting items. Gold and Silver could be spent in the Shop. Each spin of the wheel required one Ticket. Tickets were earned by completing Missions, card battles, playing Arcade games, or by destroying Troublebots in the Zones. Each Zone had a Prize Wheel, which brought up the same window. The most common result was earning 10 Silver, though you could earn up to 40.
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Prize Wheel Auto-clicker