Since actual hacks (like third-party software or "generators") can get your account banned, the most effective and safe "hacks" used by the Tsum Tsum community focus on optimizing gameplay mechanics and using specific high-tier Tsums.
Many players find that once they have unlimited coins, the sense of progression disappears, making the game feel "pointless" The "Legitimate Hacks" for Rapid Coins tsum tsum coin hack
Programs like Robotmon (free for Android) or XRobotmon (subscription-based for iOS) can be set to automatically send and receive hearts. the sense of progression disappears