4.73 712 reviews 2.2M+ blocks sold worldwide2.2M+ blocks sold

RIWI® Giant Building Blocks

The Original.

2.2M+ blocks sold worldwide2.2M+ blocks sold

RIWI® Giant Building Blocks

The Original.

  • Less screen time, more real play
  • Forts, castles & obstacle courses
  • Builds STEM skills, imagination & movement
  • Durable, safe, non-toxic
$359.95 $399.95(price per block: $9.99)

Shipped from Houston, TX with USPS Ground · ✓ Free shipping included

12 Giant Blocks FREE — on top of your set!12 Giant Blocks FREE — on top!Worth $159.95 — added to your cart automatically⏳ Limited stock — order now
Choose your set: 36 Blocks

The best combo: clever storage that doubles as play furniture.

3
1

Kept by over 98% of customers

Estimated delivery: 2–5 business days

  • 85,000+ parents trust RIWI® — in 30+ countries
  • 4.73★ · 712 verified reviews on riwi-buildit.us
  • 30-day returns — money back
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With a RIWI® set you get extra-large foam blocks that invite kids to build freely — a cozy cave, a rocket, a tall castle or a spaceship. Thanks to the giant size, kids build structures they can actually crawl into, so every game turns into a small adventure. The blocks stack and hold without any tools: put them together, build, play.

Size per block (H × W × D): 28 × 8 × 4 in (71 × 20 × 10 cm)
Weight per block: about 0.7 lb (0.32 kg)
Colors: blue, yellow, green, red — every set in an even mix
Age: 3+ — and sturdy enough for grown-ups (holds up to 242 lb / 110 kg)

Built for real family life: robust materials, kid-safe finishing and a soft, grippy feel that keeps play going for years.

Material & build

  • High-quality, tested polyurethane foam in mattress quality — soft, stable and shape-retaining
  • High-grip surface: blocks hold together on their own — no velcro, no magnets, no connectors
  • Built to last: high abrasion resistance for years of daily play

Safety

  • Tested to ASTM F963 (U.S. toy safety standard)
  • TÜV Austria tested to EN 71 — no harmful substances
  • No hard edges; holds up to 242 lb (110 kg)

Care

  • Machine-washable or hand-wash at 86 °F (30 °C)
  • Use a mild detergent — no fabric softener
  • Gently press out excess water and dry flat
  • Starter Set — 12 blocks: 3 blue · 3 yellow · 3 green · 3 red — about 8.6 lb (3.9 kg)
  • Family Set — 24 blocks: 6 of each color — about 17.4 lb (7.9 kg)
  • Giant Set — 36 blocks: 9 of each color — about 24.3 lb (11 kg)
  • Mega Set — 48 blocks: 12 of each color — ships in two boxes, about 17.4 lb (7.9 kg) each

Shipping note: the blocks arrive vacuum-compressed for safe transport. After unpacking, the foam needs up to 24 hours to fully expand and reach its final shape.

ASTM F963 (tested) OEKO-TEX® STANDARD 100 European CertiPUR™ by EUROPUR
Independently tested View all seals

Building blocks kids love.

Customer video review 1
★★★★★

Great building blocks! What I particularly love: they are washable. If you lay them out flat to dry, they regain their shape perfectly. We have the 48-piece set and build huge caves where several children can fit inside.

— Family H.
★★★★★

We could throw out every other toy we own and my kids would still be happy because all they want to do is play with their RIWIs! It promotes imagination enormously — everything from caves to entire castles is possible.

— Lauren M.
Customer video review 2
★★★★★

By far the best investment for indoor play. These blocks are functional, well-made, and allow kids to tumble and climb safely without any hard edges. Finally, a solution that keeps them active and safe at the same time!

— Mary H.
★★★★★

Radiant children's eyes and huge building fun! The material is soft, light, and grippy — perfect for stacking. A highlight is letting a tower fall over together and landing softly in a mountain of blocks. Odorless and high quality!

— Philipp
Customer video review 3
★★★★★

Just purchased my second set. There are many companies out there — but buy the original. The quality, versatility, and the fact that it still looks great in our living room makes it worth every penny. Absolute recommendation!

— Tamara H.
★★★★★

Our three children are always coming up with new ideas and love to throw themselves into their work at the end to destroy everything. Every kid builds their own thing — and the clean-up is quick because the blocks are so light.

— Benjamin
Which set is right for us?

Find your perfect RIWI® set.

All sets are compatible — start small and grow any time. More blocks, bigger builds.

12-block tower build
12 Blocks

Starter Set

Perfect for
1 child · small space · perfect gift
What you can build
Rockets, small forts, first towers
$159.95(price per block: $13.32)
$13.32 per block
#1 best seller
24-block walk-in cave
24 Blocks

Family Set

Perfect for
1–3 kids · living room · daily play
What you can build
Walk-in cave, giant tower, castle fort
$279.95$299.95(price per block: $11.66)
Now $11.66 / block
+1 2-in-1 Bag FREE
Best for groups & daycare
48-block giant ship
48 Blocks

Mega Set

Perfect for
4+ kids · playgroup · daycare
What you can build
Giant ship, full city, mega obstacle course
$479.95$499.95(price per block: $9.99)
Now $9.99 / block
+12 Blocks FREE

💡 Our #1 pick for most homes: the 24-Block Family Set — big enough for real forts and towers, easy to store when playtime's over. For playgroups, daycares and larger spaces, the 48-Block Mega Set is the move.

The best alternative to the screen is a better offer.
Real play“Less watching. More building.”

The best alternative to the screen is a better offer.

We're not anti-screen. We're pro what happens when it's off. Kids don't need another rule — they need something they actually want to do instead.

Building, moving, testing ideas, starting over: real play that holds their attention on its own.

  • Active play — building, climbing, tumbling
  • Open-ended: something new every time
  • Absorbing enough that nobody asks for the tablet
Why RIWI® exists

Built from a childhood dream.

Two friends. One memory. Towers to the ceiling. The floor is lava. Building forts and disappearing inside for hours — no instructions, no batteries, no end. That was the best toy of our childhood. And it didn't exist in stores.

Today's kids get toys with instructions, fixed rules and one right answer. Creativity on demand. Play by the manual. We missed that effortless freedom — so we built the toy we always wished we'd had.

That's RIWI®. #RaisingBuilders

RIWI® founders Roland (left) and Nicola (right) next to a RIWI block tower

Roland & Nicola — founded RIWI® in 2017

Independently tested

Seals you already know.

Our blocks and covers are tested by independent institutes: tested to ASTM F963 (US toy safety) by an accredited laboratory, OEKO-TEX® STANDARD 100 for textiles tested for harmful substances — and our foam carries the European CertiPUR™ label by EUROPUR for safety, health and the environment.

ASTM F963 logo
ASTM F963 · tested
OEKO-TEX Standard 100 seal
OEKO-TEX® STANDARD 100
European CertiPUR seal (EUROPUR)
CertiPUR™ by EUROPUR

View all certifications

All reviews

What some of our 85,000+ parents say.

Over 95% of surveyed families say RIWI® is their kids’ favorite toy.

  • 5 stars: 580 (81%)
  • 4 stars: 98 (14%)
  • 3 stars: 16 (2%)
  • 2 stars: 7 (1%)
  • 1 star: 11 (2%)
D
Dylan e.

**⭐️⭐️⭐️⭐️⭐️**

RIWI® Giant Building Blocks are a fantastic addition to our pediatric therapy space\! They’re durable, engaging, and provide endless opportunities for kids to build, move, create, and work on important developmental skills—all while having fun\!

Thank you so much, Dylan! ⭐️
It means a lot to hear that RIWI® works so well in a pediatric therapy setting – building, climbing, moving, and problem-solving all in one. That's exactly the kind of open-ended play we designed them for.
Thank you for the wonderful feedback, and for everything you do for the kids you work with!
Your RIWI® Team

L
Leah M.

I bought these blocks for my granddaughter’s 9th birthday and she has had so much fun playing with them!

D
Daniella F.

We absolutely love our RIWI foam blocks! They're soft, durable, and encourage endless imaginative play. My daughter builds everything from forts to obstacle courses, and I love that she's staying active while using her creativity. They're easy to clean, high quality, and have quickly become one of our favorite toys. Highly recommend for families looking for fun, open-ended play!

D
Demetseyis

We had so much fun building and playing together as a family! The blocks are durable, easy for kids to use, and perfect for encouraging creativity and active play. Highly recommend for families looking for an engaging toy that grows with their children’s imagination.

D
Demet s.

As a mom of two, I’m always looking for toys that are fun and encourage creativity. These giant blocks exceeded my expectations. My girls spend hours building and imagining together, and I love how durable and safe they are. A great investment for active, creative play!

A
Allison G.

These RIWI blocks are so amazing for creative and active play! Both of my kids who vary in ages from 1 to almost 4 love playing with them, especially together! We love how light weight they are so anyone can lift them and play with them. They stack together nicely and my daughter comes up with such fun and unique ideas for building that day. One day we are building a bridge, the next day a castle, and the next day a bed! Endless options for creative and imaginative play and when it’s all done, the clean up is so easy that my toddler even helps me! These could also be great in a classroom! The bright vivid colors are eye catching and really draw kids in. No screen necessary ❤️

N
Nicola

WE LOVE THEM. whole family is playing together. awesome to see this happening and I as a DAD enjoy it so much how creative and active this foam building blocks are.

A
AMBERB

If you’re looking for a toy that actually sticks (and not just for 5 minutes 🙃), let me introduce you to RIWI building blocks.

These have officially become my son’s favourite toy — and I don’t say that lightly. He asks to play with them multiple times a day, and the wildest part? He’s now insisting that every single grandparent needs a set at their house too 😂

What I love as a mom:
• Keeps him busy without screens
• Encourages creativity (he’s constantly building something new)
• Grows with him — simple stacking turns into full-on creations

What he loves:
• They’re fun, colourful, and easy to build with
• He can actually make what’s in his head (which = proud little moments 🥹)

Honestly, it’s one of those toys that feels worth it because it gets used every single day.

10/10 in this house — and apparently soon at Nana’s, Grandma’s, and every other house we visit 😅

S
Sreed

We have 15 grandchildren ages from 16 yrs old to babies. These blocks have been awesome! All the kids have been enjoying them so much.
There was an issue when we received them, we were shorted 24 blocks. I contacted customer service and had a response with 24 hours and they shipped the missing blocks right away.
We did buy 72 of these and it was a bit pricey, however it so far is the best investment so far for play days at Papaw and Nana's house.

W
Wendy R.

My grandsons LOVE these blocks!! When they arrived I was very pleased with the quality but worried that my grandsons, who are both autistic, might pull off pieces so I contacted customer service. They replied promptly and suggested the covers with a discount coupon. We hesitated because the covers cost as much as the blocks but we are SO GLAD we purchased them. Now with the vibrant well made covers the blocks are even more fantastic! The boys play with them for hours. I know they will last and be enjoyed for years to come.

L
Ladympieces

I ordered 36 blocks and 3 xl bags. Only 1 bag was shipped inside of the box with the blocks. I tried reaching out to support services several times regarding my missing items but no one ever responded. Aside from that my kids love the blocks, they are soft and safe.
I just only wish support services were better with responding to the tickets created especially when purchased items are missing. Three xl bags could not have fit in an already stuffed box of 36 blocks. Only 1 was inserted and I have no response time on the remaining bags.

Great purchase but good luck if you have any issues.

h
heidi a.
Best play blocks ever!

My kids love these blocks! They are so big and easy to clean and so many play possibilities! Definitely a great purchase!

N
Nicola

Wow, we underestimated the joy for our son (3 years). He LOVES the blocks. Everyday is RIWI play-time!

B
Benjamin
Immer wieder Spielspaß

Wir sind mit den Bausteinen von Riwi sehr zufrieden. Unsere drei Kinder kommen immer wieder auf neue Ideen und lieben es auch sich am Ende einfach in ihr Werk zu schmeißen, um alles wieder zu zerstören 😁. Selbst unsere Kleinste kann man 1,5 Jahren schon erste Sachen bauen, da die Steine so leicht sind.

M
Mayer N.
Kreativität für Kinder und Eltern

Unsere Söhne (3 und 5) haben die Klötze zu Weihnachten gekriegt und haben großen Spaß - und wir als Eltern auch!MATERIAL:Ich hatte ehrlich gesagt bei der Bestellung ein etwas festeres Material (eher wie ein Yoga-Klotz) erwartet und war dann ein wenig verwundert, dass die Klötze "nur" aus Schaumstoff sind. Das hat die Nachteile, dass die Klötze weniger stabil und anfälliger für Abnutzung sind. Unser jüngerer Sohn hat Beispielsweise aus Langeweile mal zwei Klötze angefangen auseinanderzurupfen (siehe Foto). Das würde ich grundsätzlich nicht als Produktfehler sehen sondern einfach als Eigenschaft des Materials. Finde ich aber nicht optimal.Die Vorteile des Materials sind hingegen, dass es absolut gar keine Verletzungsgefahr gibt. Die Kids können herumspringen, sich die Dinger auf den Kopf hauen oder auch mal unter einem Turm begraben werden. Da kann gar nichts passieren. Außerdem ist die Oberfläche so rau, dass die Klötze super auch in der Schräge aneinander haften.VIELFALT:Der Fantasie sind hier tatsächlich nur statische Grenzen gesetzt. Man kann super viel machen und auch für kreative Erwachsene ist hier viel Freude angesagt. Auf Grund des weichen Materials sind die Klötze nicht immer genau gleich lang. Das kann schon mal zu baulichen Problemen führen. Die lassen sich mit genug Klötzen und ein wenig Kreativität zwar lösen. Man wächst an seinen Herausforderungen. Ist aber für den Ingenieur in mir nicht ideal :DALTERSEIGNUNG:Unsere Kids haben am Anfang eher wenig selbst gebaut (vielleicht aber auch weil ich so viel Spaß daran hatte). Mit der Zeit haben sie sich aber dann Dinge abgeschaut und auch eigene Formen kreiert. Ältere Kids, die zu Besuch fanden (10 und 12 Jahre) fanden die Steine auch toll und haben mit Freude gebaut. Wir gehen also davon aus, dass die Steine lange in Gebrauch sein werden. Man braucht natürlich den entsprechenden Platz.SERVICE:Ich habe am Anfang mal telefonisch versucht, jemanden zu erreichen und das ging schnell und problemlos. Ist heute nicht selbstverständlich.Insgesamt gibt es von mir 4 Sterne. Die Gründe gegen den 5. Stern sind der hohe Preis, das hohe Verschleißpotential sowie die zum Teil ausbaufähige Maßhaltigkeit der Steine.Ich würde die Steine auf jeden Fall empfehlen!!!

z
zane
Großer Spaß zum großen Preis

Die Bausteine sorgen für viel Spaß, befeuern die Kreativität, dienen zum Turm- und Höhlenbauen, als Sprunggrube, Kletterparcour, Gästebett, Lesesofa, und und und… :)Die Qualität ist in Ordnung, zumindest gehen sie auch bei einer Kissenschlacht nicht kaputt. :)Je mehr man bestellt, umso mehr Möglichkeiten bieten sich, wodurch das Ganze relativ kostspielig wird. Ich bin dennoch sehr zufrieden und kann sie weiter empfehlen.

M
Manuel F.
Coole Bauklötze

Haben die Bauklötze für unsere Neffen und Nichten gekauft dass wenn sie auf Besuch sie etwas zum spielen haben.Man kann damit super schnell Häuschen und alle andere Arten von Gebäuden damit bauen da sie sehr gut aneinander haften.Wir sind super zufrieden damit

H
Holli M.
Super Bausteine

Wir sind begeitstert, für den Garten das perfekte Spielzeug um die Kids zu beschäftigen.Alles top und macht auch den Größeren Spaß.Können wir empfehlen - 5 Sterne.

L
Luise Z.
Sehr geile Beschäftigung für Groß & Klein

Meine Kleine (7Jahre) war hin und weg von den Steinen. Sie baut sich gerne Türme, Häuser oder legt sie einfach nur auf den Boden um von der Couch runterzuspringen. Sie und ihr Papa sind total begeistert und bauen viel damit :)Kann ich empfehlen - 5 Sterne :)

I
Ize
Genial

Mein Sohn liebt es und sogar ich habe ich Spaß 😁😍😍

K
KM
Tolle Bausteine :-)

Die Bausteine von RIWI sind einfach toll. Sie sind robust, fördern die Kreativität und Geschicklichkeit und sind sowohl für Groß und Klein geeignet. Selbst Haustiere finden ihren Platz in der selbst gebauten Höhle ;-)

Special combo offer — save 20% on the Couch Kit
24 Giant Building Blocks 24 Giant Building Blocks Build anything
2-in-1 Play Couch & Storage Kit 2-in-1 Play Couch & Storage Kit Build it, then chill on it

By day it's a fort, a tunnel, a ship. By evening, the same blocks become the comfiest seat in the house.

Play. Build. Chill.

The Play & Chill Combo

One set that builds everything — plus the cover kit that turns it into a couch and stores it away. The combo our families start with.

  • 24 Giant Building Blocks$279.95
  • 2-in-1 Play Couch & Storage Kitfrom $139.95
Combo price$391.91
$419.90 Save $27.99

Free shipping (USPS Ground) over $99 · washable covers

Different ages. Different ideas. Same blocks.
One set, every kid“One set. Every age. Every day.”

Different ages. Different ideas. Same blocks.

The four-year-old builds a cave. The eight-year-old engineers a bridge. Nobody fights over whose toy it is — because it's whatever they say it is.

One purchase that makes sense for the whole family, for years.

  • Grows with every kid from 3 to 10+
  • Siblings build together — or side by side
  • Replaces the pile of single-purpose toys
A moment to yourself is part of the plan.
For you, too“While they build, you get a minute.”

A moment to yourself is part of the plan.

When kids are deep in a build, they're absorbed — not entertained, absorbed. That's when the coffee stays hot, the book gets read, the bath actually happens.

Not as a reward. As part of the plan.

  • Independent play kids start on their own
  • Soft, light blocks they can carry and stack themselves
  • Quiet material — no crashing, no beeping
Why RIWI®?

What makes RIWI® different.

🏗️

Real walk-in builds

Kids build actual forts and caves big enough to crawl inside. No other home toy does this.

📵

Less screen time

When RIWI® comes out, the tablet disappears. Every. Single. Time.

📅

Played daily — for years

Not the toy that ends up in the corner after a week. RIWI® grows with your child.

🇪🇺

Made in Europe · TÜV Austria certified

Our own European factory. Tested to ASTM F963. Holds 242 lb. Machine-washable. Built to last.

🎨

No rules, no blueprint

Pure imagination every time — because there's no instruction manual for fun.

👨‍👩‍👧

The whole family plays

Parents get in on the action too — real quality time away from screens.

Good to know

Frequently asked questions

Ages 3 and up. The blocks are light enough for three-year-olds to carry and stack on their own, and open enough to stay interesting past age 10.

Yes — tested to ASTM F963 by an accredited lab, and TÜV Austria tested to EN 71. Soft PUR foam, no hard edges.

They stack freely — shape, size and material give builds a stable hold while staying quick to rebuild. No instructions, no connectors, no one right answer.

Each block supports up to 242 lb (110 kg) — so the couch build carries you for story time, too.

Compressed, from our U.S. warehouse. Free shipping (USPS Ground) on orders over $99. Blocks regain their full shape after unpacking.

The blocks are washable at 86 °F (30 °C) and dried flat — and the Velours and Play-Couch covers are machine-washable.

Set the stage. Then step back.

One open set. Every age from 3 up. Built by 85,000+ families in 30+ countries.

  • Free shipping $99+
  • Tested to ASTM F963
  • TÜV Austria EN 71
  • Made in Europe
  • 30-day returns
Choose your set