Fairly primitive. Missing 3,4,..N input gates, XNOR. The next level would need sequential logic (FF's) and friends likes muxes. After that, crossbars and tri

Fairly primitive. Missing 3,4,..N input gates, XNOR. The next level would need sequential logic (FF's) and friends likes muxes. After that, crossbars and tri-state buffers. Get fancy with buffers, clocks, and visualizing propagation delay, setup and hold times.