The bad news is that real world tombs aren't good for dungeon crawling. Look at this. No loops at all.
You're going back to Dungeon Course, Sobekemsaf the Builder of Tombs
You're going back to Dungeon Course, Sobekemsaf the Builder of Tombs
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*dramatic music*
But you can add collapsed areas, giant rat tunnels (or purple worms), etc, to provide alternate paths through a linear space.
At least that?