Updated challenges showing off dojo features

world/mars/README.md

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+# world
+## mars
+
+This challenge is named `mars`, and is located within module `world`.
+
+When users start this challenge, their environment will have:
+- `/flag`
+- `/challenge/orbit`
+- `/challenge/planets.txt`
+
+In this challenge, `orbit` reads in the flag and seeds random off of it.
+While this is a challenge-specific detail, it is a broadly useful idea.
+It allows for the challenge's behavior to be dynamically dependent on the flag.
+This offers a similar paradigm to instanced challenge files.
+However, it is dynamically instanced, rather than statically instanced.
+Statically instanced values may be accessed by a student, while dynamically instanced values may not be (since they are dependent on the flag).
+Which style is appropriate depends on the specifics of the challenge.

world/mars/orbit

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+#!/opt/pwn.college/python
+
+import pathlib
+import random
+
+with open("/flag") as f:
+    random.seed(f.read())
+
+planets = (pathlib.Path(__file__).parent / "planets.txt").read_text().strip().splitlines()
+
+print("This is a flag-seeded random number: {}".format(random.randint(0, 1000)))
+print(random.choice(planets))
+
+with open("/flag") as f:
+    print(f.read())

world/mars/planets.txt

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+../planets.txt