Build It, Play It: Mansion of Wonder was a Roblox event that started on June 21, 2021, and ended on July 23, 2021. It serves as a spin-off to the annual Roblox Creator Challenge events. The purpose of the event is specifically to teach players how to design their own effects by using Effect classes to make special effects. When doing so, users can follow a guide through the Developer Hub to also discover exclusive codes to redeem in-game for virtual prizes in the Avatar Shop. There was a winner placing system in the event game where players' contest submissions for the game would be when the contest ended.
|Mansion of Wonder||Roblox Build It, Play It|
|Artist Backpack||Mansion of Wonder||Discover the code from lesson 1 and redeem it in-game.|
|Ghastly Aura||Mansion of Wonder||Discover the code from lesson 2 and redeem it in-game.|
|Tomes of the Magus||Mansion of Wonder||Discover the code from lesson 3 and redeem it in-game.|
|Head Slime||Mansion of Wonder||Discover the code from lesson 4 and redeem it in-game.|
|Ring of Flames||Mansion of Wonder||Discover the code from lesson 5 and redeem it in-game.|
The Particle Contest winners were announced on August 27, 2021. They were originally supposed to be announced on August 13, 2021, but the Roblox Education Twitter account said they were still judging the submissions on August 17, 2021.
|rebirthtyp||Red's Fury||Artistic Merit|
|VolatileVector||Vector's Bubble Blower||Community Favorite|
|Amexpat||The Staff of Noel||Creative Use|
|Gibfoot||Forming Staff of Wizardry||Technical Expertise|
- On May 25, 2021, Roblox released a survey so they could receive community feedback on how to make the event experience better. This survey closed on May 27, 2021.
- On June 10, 2021, the game went public and a blog post was made giving more announcements regarding the event.
- On June 29, 2021, the event game was updated to make the Head Slime redeemable.