With these fun riddles, there is work to be done, just like on the construction site! This extension is for use with the LogiCASE starter set. Put the cards in the mechanism and put the wooden peg in the hole under the answer you think is correct. You are right? Then you can easily pull the card out of the mechanism. If it stays put, you're wrong, but just try again. This set contains 77 new riddles, designed in a fun construction site theme with work vehicles and cranes. NOTE: This set is an expansion and can only be played in combination with a LogiCASE starter set. A great gift for puzzle enthusiasts with two right hands!