This being said, we urge researchers to adhere to comprehensive and detailed characterizations to produce complete datasets, since many reports occasionally miss data on water content or other variables (elastic modulus, etc.). Complete datasets benefit everyone, including the overall landscape of mechanical properties as well as the general understanding of the underlying interactions and cross-linking mechanisms within the tough hydrogels. Finally, with this review we hope to have given a detailed overview on the state-of-theart, cutting-edge tough hydrogels, unraveled strengths and shortcomings of current systems, and pointed out possible directions and opportunities for prospective applications.