Post news RSS Heart Box walkthrough level 21-30 Official Heart Box Walkthrough Level 21-30. Heart Box - new funny physical puzzle with a little robot named Robby! Posted by creakosta on Feb 15th, 2017 Hi all! If you will not played Heart Box you can do this right now absolutely free on android, ios, windows and windows phone or on facebook! In this video you can see official Heart Box walkthrough on level 21-30 with trampoline.