Murus Gallicus is played on a 8×7 board with the following initial setup:

There are three different unit types, each representing a stack height from the original game:

• are height 1 stacks (walls). They cannot move or do anything.
• are height 2 stacks (towers), which is the max height in the regular variant.
• are height 3 stacks (catapults), advanced variant only.

A can...

• move by distributing itself into the two closest squares in any 1 direction. Target squares must be either empty or have a friendly . Empty squares become , and become . In the advanced variant becomes .
• crush a neighbouring enemy by reducing itself into a . In the advanced variant you can also crush an enemy into a .
• sacrifice itself by reducing a neighbouring enemy into a .

The in the advanced variant can fire 2 or 3 squares in a non-backwards direction. The target square must be empty or contain an enemy. The following happens:

• The firing turns into a .
• An empty target square becomes a friendly .
• A hit enemy is reduced by 1 ( -> -> -> killed).