Multitris 2.1 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The program lies within Games, more precisely Puzzle. The actual developer of the free software is swapgeek.com. We recommend checking the downloaded files with any free antivirus. The most popular version of the tool 2.1.
From the developer:
Multitris is a Java (tm) webstart game and so requires Java to play. If you don't have Java installed, don't worry. Installing it is very easy! Just go to java.com and fetch it.
Just start the game with the link above. You can play alone or with others. You can also use the online server browser to the right to auto-join new games or to look for active servers.
You may want to check out more software, such as Christmas Quest, Firewoks Extravaganza or Sudoku XL-Solver, which might be related to Multitris.