Super Mario

Mario Kart – Baby Mario vs. Baby Luigi

Two tiny racers, two tiny karts, and a surprising amount of personality packed into one small box.

Brick Rated Score

3.9/5

Set 72034 · 2025

Pieces321

Minifigs2

Year2025

Set number72034

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The verdict

I built the Biddybuggy first and grinned the whole way through, it is such a fun little shape for something this size.

This set is really two micro builds sharing a box, Baby Mario's buggy and Baby Luigi's Tri-Speeder, and each one only takes a few minutes, so it reads more like a snack than a meal. I love it for what it is, a genuinely charming pick-up-and-race toy, but I will not pretend it has the depth some other LEGO Mario Kart sets have. Get this one for the racing action and the two adorable baby figures, not for a marathon building session.

Best for: younger Mario Kart fans who want a quick, colorful build with real play value, not a display piece

The full review

What it is

This is one of the smaller entries in the LEGO Mario Kart lineup, and honestly, that is kind of the point. Instead of one big detailed kart, you get two, Baby Mario in his Biddybuggy and Baby Luigi in his Tri-Speeder, each built up in a handful of steps. The first time I clicked the Biddybuggy's little wheels into place I laughed, it has this bouncy, toy-car proportion that just feels right for a baby-scale racer. Baby Luigi's Tri-Speeder leans the other way, low and sporty, and seeing the two side by side on the table felt like a proper mini showdown before either kart had even moved an inch.

The catch

I will be straight with you about the price to piece count math here, this is a fun, playful set, not a value-per-piece powerhouse. With 321 pieces split across two vehicles and two figures, individual builds go fast, so if you are the type who wants a long evening with a set, this will not be it. It leans hard into the app-connected racing gimmick, which is charming when it works but does mean the full experience depends on having a phone or tablet nearby and the LEGO Mario Kart app installed. Take that piece away and you are left with two nicely designed but simple little toy karts.

Who it's for

I would hand this to a younger builder, or a Mario Kart superfan who wants every character and kart combination, before I would recommend it to someone hunting for a serious build. The Baby Mario and Baby Luigi figures alone are worth a smile, they are some of the most purely fun minifigure designs in the whole Super Mario line. But if display detail and build complexity are what you are after, look higher up the Mario Kart range instead, this one is built for racing across the living room floor, not sitting still on a shelf.

What works

Two distinct little vehicles in one box, the Biddybuggy and the Tri-Speeder each have their own shape and charm
The Baby Mario and Baby Luigi figures are genuinely cute and instantly recognizable, a nice change from the standard adult-scale minifigs
Green Shell and Red Shell pieces plus the app-powered interaction tiles mean this is a real toy you play a race with, not just a shelf item

Worth knowing

At 321 pieces split across two small vehicles, the actual building time is short, this will not satisfy anyone chasing a big engineering project
You need the LEGO Mario Kart app and a phone or tablet to get the full interactive racing experience, without it you are mostly just looking at two little karts
The scale is intentionally toy-like and simplified, which some older AFOL builders find a bit basic next to the more detailed adult Mario Kart sets

Sold? Grab it.

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The parts story

What the build is actually like, and the pieces worth knowing about.

Building this one feels quick and snappy rather than meditative. Each kart goes together in short, satisfying bursts, click the frame, seat the driver, snap on the wheels, and you are already reaching for the shell pieces. There is no long midsection slog here, which makes it a genuinely good pick for a first-time builder or a rainy afternoon with a kid who wants to see something finished fast.

The real standouts are the character pieces. Baby Mario and Baby Luigi are built as brick figures rather than standard minifigs, with proportions scaled to look properly babyish next to their karts, a nice bit of design work LEGO has been refining across the whole Mario Kart theme. The Green Shell and Red Shell pieces are simple but instantly recognizable, and the interaction tiles that talk to the companion app are the quiet bit of engineering doing the real work here, turning two small builds into an actual racing game rather than just static models.

Fun facts

01This set is part of the LEGO Mario Kart theme, which uses companion-app interaction tiles to power real head-to-head races between built karts, rather than the color-sensor system from the original LEGO Super Mario line.
02Baby Mario and Baby Luigi are built as scaled-down brick figures rather than standard minifigures, matching their kid-sized characters from the actual Mario Kart games.
03The set carries an official RRP around 24.99 GBP, 29.99 USD, and 29.99 EUR, making it one of the more affordable entry points into the LEGO Mario Kart range.
04On Brickset the set holds a 3.7 out of 5 community rating, reflecting real fondness for the characters alongside some feedback that the build itself is on the simple side.