▁U dd ers , ▁and ▁new ▁levels ▁in ▁each ▁location ▁are ▁opened ▁by ▁collect ing ▁Jim ' s ▁mar bles . ▁Like ▁previous ▁Earth w orm ▁Jim ▁games , ▁despite ▁many ▁platform ing ▁elements , ▁Jim ' s ▁primary ▁method ▁of ▁combat ▁comes ▁from ▁shooting ▁his ▁bl aster . ▁ ▁Plot ▁Earth w orm ▁Jim ▁is ▁hit ▁by ▁a ▁flying ▁cow ▁that ▁sends ▁him ▁into ▁a ▁com a . ▁Jim ▁aw ak ens ▁within ▁his ▁own ▁sub cons cious ▁and ▁disco vers ▁he ▁has ▁gone ▁ins ane . ▁His ▁past ▁villa ins ▁have ▁entered ▁his ▁sub cons cious ▁and ▁if ▁something ▁doesn ' t ▁happen ▁soon , ▁Jim ▁will ▁be ▁in ▁the ▁com a ▁forever . ▁His ▁super ▁e go ▁has ▁been ▁un le ashed ▁within ▁his ▁sub cons cious ▁to ▁stop ▁the ▁mad ness . ▁To ▁restore ▁his ▁san ity ▁he ▁must ▁find ▁the ▁Golden ▁U dd ers ▁of ▁luc id ity . ▁When ▁Jim ▁enters ▁his ▁sub cons cious , ▁he ▁finds ▁out ▁that ▁his ▁four ▁mind ▁ch amb ers ▁have ▁been ▁taken ▁over ▁by ▁his ▁worst ▁fear s . ▁He ▁must ▁collect ▁Golden ▁U dd ers ▁to ▁un lock ▁the ▁other ▁three ▁ch amb ers ▁and ▁Green ▁Mar bles ▁to ▁un lock ▁the ▁levels ▁within ▁the ▁chamber . ▁Jim ▁defe ats ▁four ▁villa ins ▁who ▁took ▁over ▁his ▁mind ▁ch amb ers , ▁and ▁finally ▁faces ▁the ▁person ification ▁of ▁his ▁tra uma : ▁Earth w orm ▁Kim . ▁ ▁Development ▁Short ly ▁after ▁the ▁release ▁of ▁Earth w orm