Duplo is also from Lego. It's basically just larger blocks: https://www.lego.com/da-dk/themes/duplo

And it's compatible (2:1). So if you want to fill something large in a color or do some vast ice landscape, just get Duplo blocks and build away.

There's also quattro, which is 2x duplo, and compatible

Duplo is interesting, it allows kids to quickly build pretty massive stuff if they have enough of it. But mine were done with it relatively fast and we ended up donating it to other people.

Primo and Quattro are also interesting but much more rare.

Modulex, that's rare!!

If you find some keep it.

We have a large box of duplos but my three-year-old isn't interested at all, maybe showed some interest a while ago, but mostly to build the tallest tower. Now it's time for the real legos, but I'm not sure if we'll even get any if she won't play with them.

My 2 year old daughter hasn’t really shown any interest either.

It’s weird, as a kid I wasn’t really into building stuff. Lego, wood blocks, etc. The only exception was “forts” in my woods. I could play with my Power Rangers toys for hours.

As an adult, though, I’m into it.

Side note, have you seen Magna-Tiles? My 4yo son loves them. They have magnets along the edges so you can easily stick pieces together and build structures. They are bigger than regular LEGOs, more along the lines of Duplo. And they can be pricey, but they are tons of fun for little ones! Especially when their favorite thing is to knock down whatever you build.

Odd comment in the context of the thread since Duplo is also LEGO

Even as an adult, Duplo is underrated. It's a lot of fun to noodle around with creating things in Duplo because there are more constraints and you can build a rough simulacrum of something in only a few minutes.

Duplo seems much more in the spirit of Lego sets from the '80s. Builds used fewer, but larger pieces. I enjoyed playing with the older sets because you could tear them apart and put them back together much more easily.

Newer sets look nice, but IMO are much less fun to play with. My kids still like building Lego sets, but our Duplos get played with more often.