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Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download InfiniTile Free.
InfiniTile
InfiniTile is a versatile and robust tile based level editor capable of creating complex levels in no time! It can be used in 2D or 3D based games or quick game or level prototyping.
Paint your level
Creating simple level was never so simple! Just drag your tiles to a brush and start painting your level!
Paint with everything!
A tile can be anything, from a simple 2D plane to a complex architectural piece.
I can see over forever!
There are no restrictions to size of your level in any axis. It can be infinite! Or even bigger!
Read more about InfiniTile.