A toy comprising: a toy building block comprising a first building block mating member; a snap-together electronic toy comprising a plurality of electrically conductive electrical components configured to be electrically connected together with snap-fits to form an electrical circuit, the plurality of electrically conductive electrical components comprising at least one power source, at least one powered component (36, 38, 40), and a first snap-fitting member comprising a flexible, biasing member; and an adapter (12, 14, 16, 18, 20, 22) configured to connect the toy building block to the snap-together electronic toy, the adapter (12, 14, 16, 18, 20, 22) comprising a second building block mating member (12A, 14A, 16A, 18A, 20A, 22A) which is configured to mate with the first building block mating member of the toy building block, and a second snap-fitting member (12B, 14B, 16B, 18B, 20B, 22B) which is configured to snap-fittingly mate with the first snap-fitting member of the snap-together electronic toy, wherein: (i) the adapter (12, 14, 16, 18, 20, 22) is not configured to electrically conduct electricity between the toy building block and the snap-together electronic toy; or (ii) the second building block mating member (12A, 14A, 16A, 18A, 20A, 22A) of the adapter (12, 14, 16, 18, 20, 22) is not configured to snap-fittingly mate with the first building block mating member of the toy building block. a toy building block comprising a first building block mating member; a snap-together electronic toy comprising a plurality of electrically conductive electrical components configured to be electrically connected together with snap-fits to form an electrical circuit, the plurality of electrically conductive electrical components comprising at least one power source, at least one powered component (36, 38, 40), and a first snap-fitting member comprising a flexible, biasing member; and an adapter (12, 14, 16, 18, 20, 22) configured to connect the toy building block to the snap-together electronic toy, the adapter (12, 14, 16, 18, 20, 22) comprising a second building block mating member (12A, 14A, 16A, 18A, 20A, 22A) which is configured to mate with the first building block mating member of the toy building block, and a second snap-fitting member (12B, 14B, 16B, 18B, 20B, 22B) which is configured to snap-fittingly mate with the first snap-fitting member of the snap-together electronic toy, wherein: (i) the adapter (12, 14, 16, 18, 20, 22) is not configured to electrically conduct electricity between the toy building block and the snap-together electronic toy; or (ii) the second building block mating member (12A, 14A, 16A, 18A, 20A, 22A) of the adapter (12, 14, 16, 18, 20, 22) is not configured to snap-fittingly mate with the first building block mating member of the toy building block. (i) the adapter (12, 14, 16, 18, 20, 22) is not configured to electrically conduct electricity between the toy building block and the snap-together electronic toy; or (ii) the second building block mating member (12A, 14A, 16A, 18A, 20A, 22A) of the adapter (12, 14, 16, 18, 20, 22) is not configured to snap-fittingly mate with the first building block mating member of the toy building block.