Beginner
≈ 13 hSuggested range10 h – 18 h
Official LEGO® image · © LEGO Group and/or the respective rights holders. Source: LEGO Italy ↗
Icons · SET 10303
Loop Coaster
Two loops and a lift tower turn bricks into a working miniature attraction. The build brings together scenery, structural engineering and careful mechanical adjustments.
- Pieces
- 3,756
- Release year
- 2022
- Theme
- Icons
- Set number
- 10303
- LEGO recommended age
- 18+
- Archived LEGO price
- 399.99 €
Source: LEGO Italy · Price checked on 23 October 2026. Retired set: this is the price shown on the archived LEGO page, not a current offer or a verified launch price.
Official English name verified at: LEGO English catalogue ↗ · Checked on 24 October 2026.
TIME TO BUILD
How long does it take to build Loop Coaster?
A starting point for planning your build. Times for each experience level are editorial estimates, not measurements submitted by HowLongToBuild users.
Editorial estimate informed by external reports
Intermediate
≈ 9 hSuggested range7 h – 12 hExperienced
≈ 6 h 30 minSuggested range5 h 30 min – 9 hBased 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
The structure, chain and lift need assembly and functional checks. Estimates include normal minor adjustments, but not motorisation or additional modifications.
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.
- Brick Architect · Loop Coaster ↗
The reviewer describes a build taking about 6½ hours.
Checked: 22 October 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.
Log your buildBuild your own story.
Save this set to your collection, track your progress and share your building time.
Create a free account →BEYOND THE BRICKS
Did you know?
Inside the set
Gravity does the work
The train travels through two loops under gravity. The lift takes the carriages to the top; the track and descent do the rest.
LEGO sourceFaces ready for a thrill
Six of the eleven minifigures have double-sided heads, so passengers can change expression before the ride. The lift can also be motorised with separately sold components.
LEGO sourceBeyond the set
The stories, places and inventions behind your build.
A Russian beginning
Early ancestors of today’s roller coasters included ice slides built in Russia in the seventeenth century. Wooden structures and frozen slopes offered thrills long before trains on rails.
American Physical Society · history of physicsFrom mines to amusement parks
LaMarcus Thompson drew inspiration from a mining railway that had become a tourist attraction. In 1884, he completed his Switchback Railway at Coney Island, helping roller coasters gain popularity in the United States.
American Physical Society · history of physicsWritten by HowLongToBuild · Sources are linked with each story · Checked on 22 October 2026. Historical facts and story details refer to the context described.
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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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
Loop Coaster · Selected for the building rhythm
For a project spread over several sessions we choose a relaxed ambient backdrop rather than matching the set’s name. The piano alternative adds a more distinct melodic presence.
OUR PICK
Ambient 1: Music for Airports
Brian Eno
Ambient · minimal and relaxedTry a different atmosphere
ANOTHER MOOD
In A Time Lapse (Reimagined)
Ludovico Einaudi
Piano · melodic and intimateA build to spread over several sessions: choose the more understated option when you want the instructions to take centre stage. The music does not set your pace.
Editorial 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 →
Report a problem with this set →
YOUR NEXT BUILD
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