The blue bonus cards are for use in CTW battles. You left-click on the card and drag it to the row of slots below when you start a CTW battle. Every card on the bottom row will be used in the battle, every card on the top row will be kept for later.
There are also red-coloured cards that you can click on when viewing the world map. These are the sabotage, wonder of the world, bribery, etc cards. Just left-click on the one you want to use and follow the instructions.
Hope that helps.
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I'm building a wagon! On some other part of the internets, obviously (but not that other site).
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