change problem size

src/main.rs

@@ -762,7 +762,7 @@ fn main() -> io::Result<()> {
 
     let mut g = GameGenerator {
         num_extra_towers: 2,
-        num_ring_types: 13,
+        num_ring_types: 16,
     }
     .highest_burried_score::<4>(&seed);