This webiste features 5 elements that demonstrate a variety of features present in babylon.js. This about page will provide any details that may be relevant to using the elements.
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In element 4, if the player pushes the box off the edge of the ground, it will respawn in the middle of the platform.
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The goal of element 5 is to collect crates. When the player collides with a crate, it is destroyed and another one will spawn.