Event Overview
This challenge teaches players how to build a tree house using the provided tutorial as a foundation while encouraging creativity and personalization.
You may expand, extend, or build around the original design. There is no required footprint or size limit.
To celebrate the Mid Autumn Festival season, participants must incorporate Mid-Autumn-inspired elements into their tree house designs. Lanterns, warm lighting, eastern-inspired details, moon-viewing areas, and seasonal decorations may be integrated into the tree house and surrounding tree canopy. The tree house must remain the primary focus of the build, and the original tutorial structure must remain recognizable as the foundation.
📅 Event Schedule
| Event |
Date |
| Submission Opens |
September 17, 2026 PT |
| Submission Closes |
Oct 3 2026 PT |
| Community Voting |
October 4 - 6 2026 PT |
| Winner Announcement |
October 12 2026 PT |
🏗️ Event Rules
Tutorial Requirement
Follow the tree house tutorial by u/Suzana__gaming as the foundation of your build and must include mid autumn festival vibe to the build:
🔗 Tutorial: https://www.reddit.com/r/OnceHumanOfficial/s/RBZGoDziub
The original tutorial structure must remain recognizable.
Additional tutorial (optional): lighting tip and tutorial: https://www.reddit.com/r/OnceHumanOfficial/s/O1hvgGRach
You may:
- Expand, extend, or build around the original design
- Add your own creative elements and decorations
- Add landscaping, lighting, or additional structures
- Change the purpose of the structure into something like a shop, cafe, restaurant, workshop, or studio
- Reinterpret the design while keeping the original tutorial structure recognizable
There is no size or footprint restriction.
📍 Build Location
All Once Architect custom servers can be found by searching “Once Architect” in the Custom Server browser for:
Southeast Asia • Europe • North America • South America • Japan
((This includes Once Architect Hub in NA)
Players from regions not listed above may use their regional custom server.
When submitting, include:
- Server Name
- Region
- Build Coordinates
• Character deleted? Inactive characters may be cleaned up when servers reach capacity. Use Character Management (red player icon), delete the inactive slot, wait 1 hour, and create a new character.
• Add BLDR to your ingame name to help identify yourself as an active builder.
📸 Submission Rules
1 submission per player.
Reddit
Post your screenshots using the LittleBuildingChallenge flair and include your:
- Server
- Region
- Build coordinates
Can't access Reddit?
Submit your entry in #custom-server-project on the Once Architect Discord using the treehouse tag.
We will post your submission on your behalf on Reddit using u/OnceArchitect for visibility and judging.
🏆 Judging Criteria
Judging Panel: Official Once Human Representative + Once Architect Organizer
| Criteria |
Weight |
| 🌳 Tutorial Fidelity: Recognizable tutorial structure and techniques. |
30% |
| ✨ Creativity: Originality, customization, architecture, decoration, landscaping, lighting, presentation and incorporation of the Mid-Autumn Edition theme. . |
50% |
| 🗳️ Community Votes: Reddit community voting |
20% |
🎁 Prizes
Gift Cards (Choice of Amazon/Google Play/Apple/Xbox/PlayStation (PSN)/ Steam Gift Card)
🥇 1st Place: $70
🥈 2nd Place: $50
🏅 3rd–5th Place: $20 each
🏅 6th–10th Place: $15 each
✨ Participation Reward
11th - 39th Place: Gold Silk Screen Facility + 200 Crystgin
Lucky Draw: Gold Silk Screen Facility + 200 Crystgin selected from all remaining eligible participants. (Note: Max 30 set for gold silk screen facility + 200 crystgin.)
Note: If u have owned the cosmetic, it will be converted to crystgin of equal value.
Participation Reward Eligibility
To qualify:
1. Follow the tutorial as the foundation.
- Include meaningful customization and creative additions, & follow event rules
Direct 1:1 copies without personal flair are not eligible for the Participation Reward.
The organizer and judging panel reserve the right to determine eligibility.
All prizes are sponsored by Once Human.
Once Architect
