Newest C++ Lix version:
2016-06-02. Physics are identical if you have
2015-09-02 or newer.
Lix
is an interactive rodent simulation, i.e. an action-puzzle game similar to Lemmings. Lix offers networked multiplayer and an editor for single- and multiplayer levels.
The game should run on the major operating systems, and it is public domain.
Download C++ Lix or D Lix. D Lix doesn't yet have the networking, but good singleplayer and level editing. It screencasts much better. C++ Lix is old, but it has networking.
-- Simon