This unique deck-builder uses a bidding system to acquire cards and build towers. You bid cards from your hand to your discard pile to win prize cards and build levels onto your towers. When you win a prize card, it does something special like allowing you to draw more cards or build levels of a certain material. The prize card also generates its effect when it comes up in your later bids after cycling through your discard pile into your deck. The game is about bidding just the right amount to get your towers taller without overbidding.