A toy assembly, comprising: a housing having a main housing portion, and a first set of at least one removable housing portion that is at least partially removable from the main housing portion; a first series of eyelets mounted to the first set of at least one removable housing portion; an inner object inside the housing; a motor that is connected to drive at least one drum; a first anchor having a first anchor slot having a first exit and a second exit; a first tether having a free end which has an engagement member that is unable to pass through the first exit of the first anchor slot but can pass through the second exit of the first anchor slot, wherein the first tether passes sequentially through each of the series of eyelets between the at least one drum and the first anchor; wherein, in an initial state the engagement member is positioned in the first anchor slot at the first exit of the first anchor slot, wherein, for each eyelet in succession in the first series of eyelets, a first segment of the first tether is angled relative to the eyelet and a final segment of the first tether is angled relative to the first anchor slot such that rotation of the motor to wind the first tether on the at least one drum pulls the free end of the first tether towards the first exit of the first anchor slot, and applies a first removal force on each eyelet in succession, wherein the first removal force is sufficiently strong to remove a portion of the first set of at least one removable housing portion from the main housing portion, and wherein after applying the first removal force to a final eyelet from the first series of eyelets, the first tether is angled such that rotation of the motor to wind the first tether on the at least one drum pulls the free end of the first tether towards and through the second exit of the first anchor slot, so as to remove the first tether from the first anchor. a housing having a main housing portion, and a first set of at least one removable housing portion that is at least partially removable from the main housing portion; a first series of eyelets mounted to the first set of at least one removable housing portion; an inner object inside the housing; a motor that is connected to drive at least one drum; a first anchor having a first anchor slot having a first exit and a second exit; a first tether having a free end which has an engagement member that is unable to pass through the first exit of the first anchor slot but can pass through the second exit of the first anchor slot, wherein the first tether passes sequentially through each of the series of eyelets between the at least one drum and the first anchor; wherein, in an initial state the engagement member is positioned in the first anchor slot at the first exit of the first anchor slot, wherein, for each eyelet in succession in the first series of eyelets, a first segment of the first tether is angled relative to the eyelet and a final segment of the first tether is angled relative to the first anchor slot such that rotation of the motor to wind the first tether on the at least one drum pulls the free end of the first tether towards the first exit of the first anchor slot, and applies a first removal force on each eyelet in succession, wherein the first removal force is sufficiently strong to remove a portion of the first set of at least one removable housing portion from the main housing portion, and wherein after applying the first removal force to a final eyelet from the first series of eyelets, the first tether is angled such that rotation of the motor to wind the first tether on the at least one drum pulls the free end of the first tether towards and through the second exit of the first anchor slot, so as to remove the first tether from the first anchor.