Bought to stack on a Lego table. They should be up and down. Some of the photos show that it's built from a larger hollow that creates a good height for play. They are not stacked with a depression. They are too small and will not allow you to plant a hollow or snap at the bottom. If you're using Lego to stack them, it takes a ton of them to reach a decent height and they don't stick together well, resulting in a very wobbly tower. My sons were disappointed every time he fell. These just didn't work for us. We were looking for something to put on the Lego table. We'll try Strictly Briks and see if they're any better. At least they have "legs" to help build towers.
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