Make Secret Spy Circuits. Record secret messages, build security door alarms, make a talking lie detector, investigate secret codes... plus so many more exciting projects. This kit is based on recording & play back blocks that lead you into the world of espionage. Make traps for double agents and carry out sneaky activities! All Logiblocs interact with each other. Combine this kit with other Logibloc kits available to increase the power and flexibility of your experiments!