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At the microscale, however, the conventional design of functional joints is generally not suitable due to the limitation of the manufacturing process on such a tiny size. Herein, a strategy for the design of smart microjoints (SMJs) that undergo controllable active deformation by triggering a size\u2010dependent layer\u2010by\u2010layer sequential swelling effect on SMJs in response to external stimuli is developed. The optimal encoding of SMJs that enables microcrawlers to achieve superior crawling speed (0.15 body length\u2009s<jats:sup>\u22121<\/jats:sup>) and efficiency (1.1 body length\u2009per step), as well as controllable locomotion, is demonstrated, e.g., migration along\/against the stimuli source or along a preplanned path. 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