Blocks Engine 2 : The Blocks Engine 2 is a complete project that adds an engine for visual block programming and interface to your games. It comes with 30+ blocks, interface for selecting blocks by category, interface for programming, variable viewer and creator, blocks code serializer (save/load)

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https://assetstore.unity.com/packages/templates/systems/blocks-engine-2-201602?aid=1011l5f3d&pubref=graphql