Beginner
≈ 8 hSuggested range5 h – 11 h 45 min
Official LEGO® image · © LEGO Group and/or the respective rights holders. Source: LEGO Italy ↗
Ideas · SET 21331
Sonic the Hedgehog™ – Green Hill Zone
Green Hill Zone becomes a horizontal scene with rings, obstacles and enemies, recreating classic Sonic imagery.
- Pieces
- 1,125
- Release year
- 2022
- Theme
- Ideas
- Set number
- 21331
- LEGO recommended age
- 18+
- LEGO retail price · Italy
- 79.99 €
Retired from the LEGO Italy catalogue when checked on 23 October 2026. Availability can change. Check the store for the latest information.
Retail price reported by the LEGO source for the stated market. Check the store for current price and availability; this does not establish the launch price. LEGO ↗ · Reference checked on 23 October 2026
Official English name verified at: LEGO English catalogue ↗ · Checked on 24 October 2026.
TIME TO BUILD
How long does it take to build Sonic the Hedgehog™ – Green Hill Zone?
A starting point for planning your build. Times for each experience level are editorial estimates, not measurements submitted by HowLongToBuild users.
Editorial model estimate · no verified measured building time
Intermediate
≈ 5 h 30 minSuggested range3 h 30 min – 8 hExperienced
≈ 3 h 30 minSuggested range2 h 15 min – 5 h 15 minBased on one person building the set for the first time, following the original instructions and using numbered bags where supplied. Includes normal piece-finding and minor adjustments; excludes long breaks, filming, dismantling and modifications. Sources may use different methods. This range is neither a statistical interval nor a limit: your build may take less or more time.
How we estimate times · sources and method
Chequered terrain, loop curve and tiny details require accurate repetition. The three central durations are model-specific editorial assessments. Planning ranges extend approximately from 65% to 145%, rounded to quarter-hours; they are not measured experience-level averages or guaranteed limits.
Sources do not always specify the builder’s experience. The three experience bands are our editorial assessment, based on the complexity of the set and individual accounts where available.
- LEGO Italy · Sonic the Hedgehog™ – Green Hill Zone ↗
This source documents the model’s features and components, not a timed build. No sufficiently verifiable individual building-time report has been identified for this set.
- LEGO building instructions · Sonic the Hedgehog™ – Green Hill Zone ↗
Set-specific instructions checked against the set number, piece count and year. The duration is an editorial assessment based on piece count, construction type, mechanisms and detail.
Checked: 23 ottobre 2026 · Method v1.0 · Limited reports; not a statistical average.
BUILT BY THE COMMUNITY
Yours could be the first building time.
0 reviewed solo building times.
No solo building times have been reviewed yet. You can still find editorial estimates under Suggested times.
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How much display space does it need?
Model or component measured by LEGO
- Height
- ≈ 17 cm
- Width
- ≈ 36 cm
- Depth / length
- ≈ 6 cm
These measurements refer to the model or component in the original specification below. Other builds, poses or arrangements may need additional space.
Check your shelf space
Which model was measured? · original Italian specification
Fantastico oggetto da esposizione: la Green Hill Zone costruibile misura 17 cm di altezza, 36 cm di larghezza e 6 cm di profondità. È possibile…Approximate assembled-model measurements, not packaging dimensions. Allow extra room for handling, moving parts and the display stand. The comparison uses the measured model’s overall footprint, allows a 90° rotation and does not assess stability or shelf load. Source LEGO ↗ · 2026-10-29
BEYOND THE BRICKS
Did you know?
Inside the set
A spring for jumping
A mechanism launches Sonic into the scene.
LEGO sourceSeven Emeralds
A display collects seven Chaos Emeralds alongside the minifigure.
LEGO sourceBeyond the set
The stories, places and inventions behind your build.
A character for Mega Drive
Sonic grew from a project to give Mega Drive a fast game and SEGA a recognisable character.
Read the full story
SEGA wanted a game demonstrating its console and a character representing the company. Its retrospective connects speed-oriented design, cartoon artwork and blue-and-white colours. Sonic’s appearance and movement therefore helped build the manufacturer’s identity as well as an individual adventure.
The 1991 debut
The official twentieth-anniversary timeline dates Sonic the Hedgehog’s debut to 23 June 1991.
Read the full story
SEGA dates the North American debut to 23 June 1991. The game takes its protagonist’s name and makes speed central to his identity. Sequels and other platforms follow, preceding later adaptations that retain his appearance while using different forms of storytelling.
Expanded stories updated on 29 October 2026
Written by HowLongToBuild · Sources are linked with each story · Checked on 23 October 2026. Historical facts and story details refer to the context described.
BEYOND THE BRICKS
Keep the story going
Films, series, games, books and music connected to this model or its universe.
Sonic the Hedgehog
Another adventure in the same universe, for before or after your build.
Title search on JustWatch: choose the result matching the title and year above.Streaming: Italian catalogue. Check availability, languages and terms on the external service. Searches are labelled; book results may include different editions.
Suggest a work or report a wrong connection →THE COMMUNITY’S EXPERIENCE
What was it like to build?
Three separate scores from 1 to 10. For difficulty, 1 means very easy and 10 means very difficult.
No approved ratings yet. Scores are never generated by this site or inferred from the recommended age.
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Building tips from the community
Specific steps, useful checks and sticking points. Contributions appear after moderation, in their original language. Do not upload instruction pages or personal contact details.
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Sign in to contributeSET THE MOOD
A soundtrack for your build
· Selected for the building rhythm
An understated option for following the instructions and working on details, without claiming a narrative connection to the subject. This pairing follows the pace of the session; the alternatives let you change the mood.
OUR PICK
Dis
Jan Garbarek
Intimate and spaciousEditorial suggestions, not official soundtracks for the set. External services may require an account or subscription; editions and availability can vary by country. Suggest another soundtrack →
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YOUR NEXT BUILD
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Official LEGO® image · © LEGO Group and/or the respective rights holders. Source: LEGO Italy ↗
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