diff --git a/src/java/com/threerings/puzzle/client/PuzzleController.java b/src/java/com/threerings/puzzle/client/PuzzleController.java
index 56f287e3..61dffaad 100644
--- a/src/java/com/threerings/puzzle/client/PuzzleController.java
+++ b/src/java/com/threerings/puzzle/client/PuzzleController.java
@@ -713,6 +713,8 @@ public abstract class PuzzleController extends GameController
             return;
         }
 
+        getBoard().seedFromEvent(getPlayerIndex(), event);
+
         _events.add(Integer.valueOf(event));
         if (isSyncingBoards()) {
             _states.add((board == null) ? null : board.clone());
diff --git a/src/java/com/threerings/puzzle/data/Board.java b/src/java/com/threerings/puzzle/data/Board.java
index 3ebe20a7..bd8983ca 100644
--- a/src/java/com/threerings/puzzle/data/Board.java
+++ b/src/java/com/threerings/puzzle/data/Board.java
@@ -85,6 +85,40 @@ public abstract class Board
     {
     }
 
+    /**
+     * Allows puzzles to add extra noise to their random number generators based on the specific
+     * events sent from the client to make it more difficult for a hacked client to predict things
+     * such as piece generation.
+     *
+     * @param pidx the player index that submitted the progress event.
+     * @param gevent the progress event itself.
+     */
+    public void seedFromEvent (int pidx, int gevent)
+    {
+        if (isSeedingEvent(pidx, gevent)) {
+            _rando.next(getSeedForEvent(pidx, gevent));
+        }
+    }
+
+    /**
+     * Returns whether this event is the sort of thing we should use to generate extra noise on
+     * our random number generator.
+     */
+    protected boolean isSeedingEvent (int pidx, int gevent)
+    {
+        return false; // By default, nothing is
+    }
+
+    /**
+     * Returns a number of bits to read off the random number generator for this event.
+     * Subclasses can replace this with something that better understands the formats of its
+     * particular events if desired.
+     */
+    protected int getSeedForEvent (int pidx, int gevent)
+    {
+        return (pidx ^ gevent) % 7;
+    }
+
     /** Used to generate random numbers. */
     protected static class BoardRandom extends Random
         implements Cloneable
diff --git a/src/java/com/threerings/puzzle/server/PuzzleManager.java b/src/java/com/threerings/puzzle/server/PuzzleManager.java
index 62aef0b4..42834bee 100644
--- a/src/java/com/threerings/puzzle/server/PuzzleManager.java
+++ b/src/java/com/threerings/puzzle/server/PuzzleManager.java
@@ -371,6 +371,8 @@ public abstract class PuzzleManager extends GameManager
                 compareBoards(pidx, cboard, gevent, before);
             }
 
+            _boards[pidx].seedFromEvent(pidx, gevent);
+
             // apply the event to the player's board
             if (!applyProgressEvent(pidx, gevent, cboard)) {
                 log.warning("Unknown event", "puzzle", where(), "pidx", pidx, "event", gevent);
@@ -426,7 +428,7 @@ public abstract class PuzzleManager extends GameManager
      *
      * @param pidx the player index that submitted the progress event.
      * @param gevent the progress event itself.
-     * @param cboard a snapshot of the board on the client iff the client has board syncing
+     * @param cboard a snapshot of the board on the client if the client has board syncing
      * enabled (which is only enabled when debugging).
      *
      * @return true to indicate that the event was handled.