The TUKI BIG Magnetic Blocks Builder 12 is a different category of product from the Regular range. Where TUKI Regular blocks are 5cm cubes sized for tabletop and fine motor building, TUKI BIG blocks are 10cm cubes - twice the linear dimension, eight times the volume per block. These are large-format floor building blocks. A child does not sit at a table and place them with fingertips; they pick them up with both hands, carry them, position them on the floor, and build structures that reach knee height and beyond from the first dozen pieces. That physical scale changes the developmental experience entirely - from fine motor construction to whole-body, proprioceptive, large-muscle building activity.

The Builder 12 is the entry-point set to the TUKI BIG range, containing 12 magnetic foam blocks in three confirmed shapes - cubes, beams, and L-shaped pieces - that provide the geometric variety needed for basic engineering principles, balance, symmetry and problem-solving from a small starting collection. Each block is made from closed-cell EVA foam with a waterproof rotating neodymium magnet capsule so every face attracts every other face in any orientation. The blocks are EN71-certified, BPA-free, non-toxic, and independently safety-tested. At 3kg for 12 blocks the set packages in a 30x30x30cm storage bag - compact enough for a therapy room kit, a travel play resource, or a starting collection that scales upward as the programme grows.

The set is fully compatible with all other TUKI BIG BUILDER and SMART sets. A setting that starts with the Builder 12 can add the Builder 26 or any SMART set without compatibility concerns, building a collection that grows from 12 to 280 elements using identical blocks throughout. 

Key Features of the TUKI BIG Magnetic Blocks Set - Builder 12

• 12 Large Magnetic Foam Blocks at 10cm x 10cm x 10cm - Each block is a full 10cm cube - twice the linear dimension of the Regular range and eight times the volume per block; the BIG format is designed for floor-scale construction with both hands, building structures at a physical scale that small magnetic tiles and tabletop blocks cannot approach
• Three Confirmed Shapes - Cubes, Beams and L-Shapes - The Builder 12 includes all three primary TUKI BIG shapes: cubes for stacking and corner connections, beams for spanning and bridging, and L-shaped pieces for angles and more complex structural forms; together these three shapes provide the geometric foundation for basic engineering, balance, and spatial problem-solving
• Rotating Neodymium Magnet Capsules - Full-Angle Connectivity - Each block contains a neodymium magnet in a waterproof rotating capsule providing full-angle connectivity; every face of every block attracts every face of every other block in any orientation, with no repelling faces and no failed connections
• Closed-Cell EVA Foam - Waterproof, Wipeable and Floating - Made from closed-cell EVA foam that does not absorb water; the blocks are completely waterproof, wipe clean or disinfect in seconds, and float - suitable for sensory water play, pool and bath use, and shared institutional settings where hygiene between uses is a requirement
• EN71-Certified, BPA-Free and Non-Toxic - Certified to EN71-1, EN71-2, and EN71-3 European toy safety standards; BPA-free and non-toxic; independently tested for heavy metal migration, non-flammability, and mechanical safety; appropriate for use in kindergartens, therapy rooms, hospitals, and all regulated early years settings
• Compatible with All TUKI BIG BUILDER and SMART Sets - Every block in the Builder 12 is fully compatible with all other TUKI BIG BUILDER and SMART sets; a setting that starts with 12 elements can scale to 26, 100, 160, 240, or 280 elements using identical blocks, without compatibility or replacement concerns
• 3kg Set - 30x30x30cm Storage Bag Included - The full 12-block set weighs 3kg and packages in a 30x30x30cm storage bag; compact enough for a therapy room kit or travel resource, and structured for organised pack-away in institutional settings
• Lightweight Per Block - Safe for All Ages - Despite the large 10cm format, individual blocks are lightweight enough for young children to lift, carry, and position independently; the combination of large size and low weight makes floor building accessible from the earliest developmental stages
• Poland's Toy of the Year 2023 - Made in Poland - Awarded Poland's Toy of the Year 2023 and manufactured in Poland to EN71 European standards; the award reflects the product's recognition as a genuine innovation in magnetic construction play

Why 10cm Blocks Develop Different Skills From Small-Format Magnetic Construction

The developmental literature on block play consistently distinguishes between tabletop fine motor construction and floor-scale whole-body construction as two distinct activity types with different developmental profiles. Tabletop magnetic tile building develops hand-eye coordination, fine motor precision, and the focused seated attention that supports writing readiness. Floor building with large-format blocks develops gross motor planning, bilateral coordination, spatial awareness at body scale, proprioceptive body mapping through heavy lifting and carrying, and the physical confidence that comes from building structures that are architecturally significant relative to the builder's own body size.

TUKI BIG blocks sit squarely in the floor-building category. A 10cm cube that a child picks up with both hands, walks across a room with, and places at height is a whole-body motor activity. Stacking four of them to knee height requires postural control, core stability, and the proprioceptive body awareness that occupational therapists target in gross motor sessions. Building a structure that spans a room with beams and L-shapes requires motor planning, spatial problem-solving, and the sustained physical engagement that keeps children in active, embodied learning for extended periods.

Skills and Developmental Outcomes

• Gross Motor Planning and Bilateral Coordination - Picking up, carrying, and placing 10cm foam blocks develops the bilateral coordination, motor planning, and whole-body spatial awareness that large-format floor construction uniquely provides
• Core Strength and Postural Stability - Stacking large blocks to height, reaching across a floor structure, and bending to place ground-level pieces develops the core strength, postural stability, and dynamic balance that are foundations of physical confidence and school-based physical readiness
• Spatial Reasoning and Early Engineering - Building three-dimensional structures from cubes, beams and L-shapes at floor scale develops spatial reasoning, 3D mental modelling, and basic engineering principles - balance, span, symmetry, load-bearing - in a concrete, physical context
• Fine Motor Skills Within Large-Format Play - While the primary motor challenge is gross motor, precise block placement and connection still develops hand-eye coordination and the grip control that bridges gross and fine motor development
• Creative Expression and Sustained Imaginative Play - Open-ended large-format construction with no prescribed outcome supports extended imaginative play, narrative construction, and the creative thinking that building at architectural scale naturally generates
• Collaborative Play and Social Communication - Large-format floor building naturally invites multiple children; negotiating structure design, assigning building zones, and combining sub-builds develops the turn-taking, joint planning, and social communication that institutional settings target through construction play
• Sensory and Proprioceptive Processing - Handling large, weighted foam blocks provides rich proprioceptive input through muscle loading during lifting and carrying, and deep pressure through whole-hand grip contact; the tactile quality of closed-cell EVA foam is distinct from plastic and wood surfaces

Ideal for

• Occupational therapy clinics and physiotherapy rooms incorporating large-format floor building into gross motor, balance, and proprioceptive development sessions
• Sensory rooms and multi-sensory environments where large-format building adds a physical, whole-body construction element
• Kindergartens, preschools, and childcare centres looking for an EN71-certified, wipeable, institutional-grade construction resource
• Hotels, shopping centre playrooms, aquaparks, and commercial play facilities requiring hygienic, durable, large-format building blocks
• Children's hospitals, rehabilitation centres, and therapeutic play environments where safety certification, disinfectability, and safe-for-all-ages construction are priorities
• Families wanting a floor-scale magnetic building set that genuinely develops gross motor skills alongside creativity and spatial reasoning
• Existing TUKI Regular owners looking to add a large-format floor building dimension to their TUKI collection

• Single block: 10×10×10 cm
• Set/packaging: 30 x 30 x 30 cm
• Weight: 3 kg|
• Material: Closed-cell EVA foam, BPA-free, non-toxic
• Magnet type: Neodymium magnets in waterproof rotating capsules