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there miight be a problem with the generating of the tunnels on hard mode because very rarely, tunnels seem to collide with each other or partially go through each other. eg there were bits of red moving blocks half way through a cured tunnel (which btw caused me to crash but np)
i tried every possible route i will NEVER get that hour of MY LIFE back
p.s. don't waste your life trying to finish it + this to help save people's from falling into the trap of never ending TIME
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Sorry!