The paper explores the possibility that primordial black holes (PBHs) could constitute all of the dark matter in the universe, particularly within the framework of the dark dimension scenario. The dark dimension is a compact extra dimension that connects to the cosmological hierarchy problem and dark matter candidates. The authors re-examine the limits on PBHs as dark matter candidates based on gamma-ray emission from Hawking evaporation and the diffuse gamma-ray emission in the direction of the Galactic center, which provides the most solid upper limits on the dark matter fraction composed of PBHs. They find that the revised mass range allowing PBHs to assemble all cosmological dark matter is estimated to be $10^{15} \lesssim M_{BH}/g \lesssim 10^{21}$. They also investigate the main characteristics of PBHs localized in the bulk and show that PBHs localized in the bulk can make all cosmological dark matter if $10^{11} \lesssim M_{BH}/g \lesssim 10^{21}$. The paper also comments on the black holes that could be produced if one advocates a space with two boundaries for the dark dimension. The authors conclude that the dark dimension scenario provides robust predictions for PBHs as dark matter candidates, and that the memory burden effect does not modify this mass range. They also discuss the implications of the dark dimension scenario for the dark graviton gas and the possibility of alternative dark matter candidates. The paper concludes that the dark dimension scenario provides a viable framework for understanding the dark matter composition of the universe.The paper explores the possibility that primordial black holes (PBHs) could constitute all of the dark matter in the universe, particularly within the framework of the dark dimension scenario. The dark dimension is a compact extra dimension that connects to the cosmological hierarchy problem and dark matter candidates. The authors re-examine the limits on PBHs as dark matter candidates based on gamma-ray emission from Hawking evaporation and the diffuse gamma-ray emission in the direction of the Galactic center, which provides the most solid upper limits on the dark matter fraction composed of PBHs. They find that the revised mass range allowing PBHs to assemble all cosmological dark matter is estimated to be $10^{15} \lesssim M_{BH}/g \lesssim 10^{21}$. They also investigate the main characteristics of PBHs localized in the bulk and show that PBHs localized in the bulk can make all cosmological dark matter if $10^{11} \lesssim M_{BH}/g \lesssim 10^{21}$. The paper also comments on the black holes that could be produced if one advocates a space with two boundaries for the dark dimension. The authors conclude that the dark dimension scenario provides robust predictions for PBHs as dark matter candidates, and that the memory burden effect does not modify this mass range. They also discuss the implications of the dark dimension scenario for the dark graviton gas and the possibility of alternative dark matter candidates. The paper concludes that the dark dimension scenario provides a viable framework for understanding the dark matter composition of the universe.