You can watch a snippet below:
Kim, 41, gave the tour back in 2020, but the clip has recently resurfaced on @kardashianland's TikTok this week.
And the playroom is huge, featuring a stage, heaps of musical instruments, loads of toys, and a play ice cream parlour, washer, dryer, kitchen and grocery store.
There's even colour co-ordinated lego, and a whole closet filled with different arts and crafts, as well as an entire fancy dress costume section.
"I'm cleaning up for the night and just because you guys always say your house is so minimal, you guys haven't seen my playroom," said Kim.
"So we have our stage here where the kids often have a band and over here is our projector, so they watch movies while they sit in the playroom. We have our sing along instruments and violins. The kids play instruments, North plays violin."
Kim continued: "This is Chi's world over here, you have her ice cream parlour, grocery store and you can like actually ring people up in the grocery store, it's like really crazy.
"... And then you guys have to see, we have this whole organised situation of slime, bubbles and crayons and it's all colour co-ordinated."
And followers were blown away by the playroom, with one writing: "I love how everyone has their own station so cute."
While another commented: "This playroom bigger than my house omg."
A third added: "This is like a dream come true for a kid."
"This is so fun love this for her that they’re not just on phones and stuff," added a fourth.
Another wrote: "That little grocery store house area for Chicago is literally what I wanted in my childhood."
Our inner child is screaming!