For similar or scaled tetrads, see Scaled Tetrads for Polydrafters.
The smallest polydrafter tetrad, allowing cells off the polyiamond grid, uses a tetradrafter:
The smallest polydrafter with all cells on the polyiamond grid that forms a tetrad with some cells off the grid is this hexadrafter:
The smallest symmetric polydrafter that forms a tetrad is this extended hexadrafter:
The smallest polydrafters on the polyiamond grid that form tetrads on the grid are these octadrafters:
Last revised 2020-03-17.