The Beta version of Caesar in Gaul computer game is ready, and a free download. LINK
Additionally there are some undocumented features in the game.
Siege Report - click the image of the siege hex on the report and the unit popup window for that hex opens.
Combat - right click on a cavalry sets it to charge, and will return it to the reserve after the combat round.
Say you are the Gaul player and are attacking. It automatically puts 3 12-3 heavy infantry in your front line.
You want to save them for defense, not take them as losses.
Click on the unit you want to remove from the front line - it becomes highlighted, then click on the unit in the reserve you want to replace
Also useful for the Roman player when they have allied units and an allied leader - replace a more valuable unit with a 5-5 light infantry.
Then it can take the 2 step loss with an AL1/DL1 result against Gaul heavy infantry.
You can also swap out a Roman heavy cavalry for a light cavalry to save the larger unit for cleaning up routed units later in the combat