Defeat Dr. M before time runs out.
― In-game description
"Battle Against Time" is the fifth and final Master Thief Challenge in "Honor Among Thieves" of Sly 3: Honor Among Thieves, and it is also the final challenge overall. It is a variation of the first part of the "Final Legacy" mission, where Sly must almost completely deplete Dr. M's health, but there is a time limit.
Video[]
Sly 3 Honor Among Thieves - Master Thief Challenge - Battle Against Time