Is there a way to force a leaderboard update without making additional progress in the game?  Last time I scored a point in Uberschizoid, my XBL connection dropped and my score was not uploaded.  I tried improving my score in Wingman, hoping it would just update all my scores, but no luck.  The only way I can improve my Uberschizoid score is to complete Infinity Chamber 11, a feat I have not yet been able to pull off.

The only way you can update a score is to get a higher medal or do better than your previous attempt on a specific level.

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Zombies everywhere, zombies everywhere, zombies everywhere. They're coming for your brains and it's too late to change.