The Grimrock website announces the release of Legend of Grimrock 2 for OS X, saying the RPG sequel is on sale everywhere for 40% off to celebrate. Here's word:

The Mac version naturally ships with the latest version of the Grimrock engine, and we are also launching a patch today for the Windows version of the game which improves performance and input latency, and fixes a few bugs in the main campaign. Modders of Grimrock 2 should be happy to know that the new modding capabilities coded during the latest Gloegg session in February are also included in this build. The latest version of the game is currently 2.2.4, and you can find the full changelog below.

The game should automatically update for you if you have the game already purchased through Steam (you may need to restart the Steam client). If you are a customer of GOG or our store, you can either redownload the game or install the following patch: version 2.1.18 to 2.2.4. The patch also works with GOG installations but there is a slight kink. When a dialog appears saying that an existing installation can not be found and the patcher asks “Abort Installation?”, select No. You have to then navigate to the installation location of your GOG version of Legend of Grimrock 2.