strictly briks beginner briks 12.5 x 15 inch baseplate, 100% compatible with mega bloks first builder blocks, 10 x 12 large pegs for toddlers, single tight fit stackable base plate, blue strictly briks strictly briks beginner briks 12.5 x 15 inch baseplate, 100% compatible with mega bloks first builder blocks, 10 x 12 large pegs for toddlers, single tight fit stackable base plate, blue