Three-dimensional (3D) nuclear charts were created using toy blocks, which represent the atomic masses per nucleon number and the total half-lives for each nucleus in the entire region of the nuclear mass. The bulk properties of the nuclei can be easily understood by using these charts. Subsequently, these charts were used in outreach activities for the general public and high school students. As an example, an application for a lecture on nucleosynthesis in stars is introduced, and some explanations for the abundance of iron and the origin of uranium and heavy elements on the Earth are given with the 3D chart.