You may be familiar with Linden Lab as the folks behind the once very popular online world Second Life. The company also has a cross-platform mobile app called Creatorverse, which used to cost $4.99. Now, that app is free with in-app purchases, and users who paid for it are a bit confused.
Creatorverse is a sandbox-style app that lets you build various contraptions, machines, and puzzles with a wide array of tools. You can think of it like Apparatus, but even more open. The free version of Creatorverse includes a subset of the tools from the original paid edition, but Linden Lab says anyone who paid for the app will still get access to premium features at no additional charge.