Now with Drools demo (Rete System to match which level building rules to fire for which PlayerProfiles/Archetypes).

rules/BasicAccountRule.drl

@@ -0,0 +1,7 @@
+package org.drools.examples.simple;  
+rule "Account balance is less than 100"
+ when  
+  $account : Account( balance < 100 ) // condition  
+ then  
+   System.out.println("Account number: " + $account.getId() + " is below 100"); // consequence  
+end