 The study presents two hybrid lattice block structures, geo-underscore embedded and geo-underscore unfolded, designed using grid unit and octet unit basic units which were additively manufactured to evaluate their stiffness and energy absorption capabilities. Results show that the hybrid lattice blocks have comparable stiffness to uniform lattice blocks but better energy absorption capability. This study contributes to the performance of hybrid lightweight structures. This article was authored by John Huijong, Chinpu Huang, Gan Liu, and others.