Supramolecular weak interactions can be used for preparing functional self-assembled architectures by powerful bottom-up approaches. In particular, when closed-shell metallophilic and pi-pi interactions between adjacent transition-metal complexes are established, profound changes in compounds' properties are obtained and novel features often achieved. In this Review, the most recent advances in the field of luminescent platinum(II) complexes aggregating through Pt-Pt interactions are highlighted and their potential application in different fields presented and discussed.