Abstract: The present invention provides an educational device for teaching various subjects utilizing a tray with an array of contact-embedded recesses for receiving a plurality of stackable blocks with corresponding contacts. Each block includes an electrical component such as resistors and/or capacitors, the value of which is ascertained by a processing circuit within the tray. Each block represents a particular portion of program code, such that the placement of the blocks creates program code comprising the code portions represented by the blocks. Upon a button press by the user the tray then sends information about the blocks present on the tray to an output device. The tray has the capability of sending messages representing the blocks to a variety of outputs via a wireless communication device.