FuguIta is a live system based on OpenBSD.
FuguIta-6.6-amd64-202002171.img.gz is a raw disk image for amd64 platform.
This file is compressed. After downloading, decompress the file with the gzip utility and write it to a USB memory device with a size of 2 GB or more using the dd command.
For more information about FuguIta, visit http://fuguita.org/ .