Elite, Veteran, Regular, Conscript(??). 
Either played on the same level, with Regulars' score given a handicap of 33% over Veterans (if you WANT to track scores);
or Veterans play at higher difficulty, though that might make it "difficult" to compare games.

Either played on the same level, with Regulars' score given a handicap of 33% over Veterans (if you WANT to track scores);
or Veterans play at higher difficulty, though that might make it "difficult" to compare games.
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