While traveling in VoidTrain, fireflies can appear on the way that will point a way to the Puzzle Islands. Metal rings will help to get to these islands. The players can easily pull themselves up to the stones using a wrist winch. But if they are not attentive enough, fireflies can be missed submitted by /u/KenjiNoboru
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Source and More information: While traveling in VoidTrain, fireflies can appear on the way that will point a way to the Puzzle Islands. Metal rings will help to get to these islands. The players can easily pull themselves up to the stones using a wrist winch. But if they are not attentive enough, fireflies can be missed

Author: Reddit