This paper advocates the use of free and open source interactive computerized design tool "Cedar Logic” for the design of combinational and sequential logic circuits. This tool provides a modern approach to fill the gap in the currently available computer based teaching software, with the purpose of providing alternative-mode subject delivery. The Cedar Logic is used to show the link between Boolean algebra and combinatorial and sequential circuits. Each circuit introduces new concepts and produces the complete design of a stand-alone apparatus that is fun and interesting to use.