Yes, we have designed and engineered these building blocks to be durable enough to withstand a child sitting on them! Even an adult can take a seat! However, we do recommend that you make sure you're balancing out the weight that you're placing on the blocks by covering them with a flat surface before taking a seat.
The certified average weight hold for building blocks is 59 pounds (27 kilograms) for XXL blocks or 53 pounds (24 kilograms) for XL blocks. Please take a look at our videos to see the durability of GIGI Bloks in action.