I have this marble race thing that you put together. It’s by discovery. It has all the pieces except a couple of marbles it still has a bunch of marbles to use. You don’t use them all at the same time anyways. You can put it together a few different ways. There are instructions that I tore in half by accident when I was taking them out to count the pieces. After you put it together there are multiple areas to put the marbles in. It says 3+ on the box but I’m not going to lie if you buy it for a 3 year old you will be putting it together yourself I feel like it’s a little hard for someone that young to put together. If interested text me. Thanks