Blocksworld

In Blocksworld, players could build using 3D building blocks that could be combined to construct simple or complex creations. Players could also use "action blocks" and a drag-and-drop visual programming tool to add interactivity to their creations. Examples included drivable cars, flyable jets, and playable games with win/lose conditions, health systems, and other attributes. Players could also upload their creations for others to play. Blocksworld also included a feature where players could redeem a certain number of in-game coins for real money.

Not only did Blocksworld serve as a tool to make games, a full-sized community and an online marketplace for models (that can be bought with coins, the in-game currency) was included, where players could play worlds (community-made games) that other users made. Before Blocksworld was shut down by Linden in 2020, over 38 million worlds were hosted by the Blocksworld servers. Blocksworld also implemented community moderation; newly published worlds had to get "approved", and members of the community could "moderate" pending worlds by simply playtesting the world and approving or rejecting it. Another feature, the Prize Wheel, allowed players to spin a wheel and get a new block, texture, etc.

Blocksworld was initially developed by Swedish independent video game developer BoldaiAB. Originally slated to release in summer 2012, the game was presented as part of the Nordic Game 2012 conference, where BoldaiAB was awarded a 10,000-euro investment from the Nordic Game Fund. A paid version of the game was later released on November 21, 2012 in Sweden, Finland, Denmark, and Norway, and was originally intended to release worldwide on December 13, 2012 for $0.99 USD. However, it was later pushed back when the US-based Linden Lab acquired BoldaiAB. For the subsequent global release, the game was repositioned as a freemium offering where players had the option to purchase premium sets and games, additional building objects and pieces, coins, and other upgrades and extras for a small fee.

On March 3, 2016, Linden Lab released a press release announcing Blocksworld's expansion to iPhone devices. It was later added to Steam on September 25, 2017.

Despite the game's shutdown in 2020, it still retains an active player base. Blocksworld: The Secondary Server, also known simply as Blocksworld 2, is an unofficial fan revival project which started in 2019. In 2026, however, the founder of Blocksworld 2 has announced the shutdown of the main servers, citing lack of motivation and time to continue the project. Though, the community co-owners have also stated that there will be ways for players to self-host their own Blocksworld 2 servers.

Martin Magni, one of the developers of the BoldaiAB version of Blocksworld, released what is considered a successor to Blocksworld in 2020, called Fancade. Fancade shares many of the same features Blocksworld had, such as the ability for players to create their own games as well as playing others.