Add hemimegaminx scrambling rules

Author: HactarCE

docs/leaderboards/rules.md

@@ -42,11 +42,18 @@ These rules apply generally to speedsolving submissions unless the category has
     - Final time = memorization time + solving time.
     - Writing anything down isn't allowed.
 
-### Physical rules
+### Real-life puzzle rules
+
+- All real-life puzzle solves video evidence that shows the puzzle fully in frame throughout the solve and shows the entire scrambling and solving process as well as the timer.
+- Scrambles **must** be generated by a computer program that produces a random state or at least this many random moves:
+    - Physical 2^4^: see below
+    - Hemimegaminx: 30 moves
+
+#### Physical 2^4^ rules
 
 See [Canonical Moves](/puzzles/physical/2x2x2x2/canonical-moves) for more details.
 
-- All physical solves require video evidence that shows the puzzle fully in frame throughout the solve and shows the entire scrambling and solving process as well as the timer.
+- All rules for real-life puzzles apply.
 - Allowed moves for physical 2x2x2x2 events are limited to 2 categories, the canonical moveset originally made by the hypercubing mailing list as well as a few additional moves:
     - Canonical moves:
         - All R and L cell rotations
@@ -58,9 +65,10 @@ See [Canonical Moves](/puzzles/physical/2x2x2x2/canonical-moves) for more detail
         - U/D x2/z2
         - F/B x2/y2
         - I y2/z2
-- Scrambles **must** be generated by [this page](/puzzles/physical/2x2x2x2/scramble-generator) or any equivalent scramble generator.
+- For 2^4^, scrambles **must** be generated by [this page](/puzzles/physical/2x2x2x2/scramble-generator) or any equivalent scramble generator.
     - **Hand scrambles are no longer allowed**, as they have an increased chance to have an easier solution than random state scrambles.
     - It's ok if you mess up the scramble a little bit. It should still be way more random than any hand scramble.
+    - For random-move scrambles:
 - Any full puzzle rotation that doesn't change the state (including the Gyro) may be applied to the puzzle during inspection; other moves may not.
 
 ## Fewest-moves solving rules