Note: Due to both the cut main menu and Arena mode being cut from the shipped game, the textures for both are not present in the files, so the player must extract these from the Multiplayer Alpha. Start AoM and navigate through the changed menu (from the Alpha) and find 'Arena'.Rename uipregame.xmb to uipregamenew.xmb and then paste it in the /data folder.Using BARExplorer enter the data/data2.bar (For Vanilla, and Titans respectively) and extract uipregame.xmb and uipregamenew.xmb.Download BARExplorer, or AoMED, either preferably from AoMH.It is also possible it was a harder version of the campaign, with killable heroes, less resources, and even tougher enemies before the Titan mode was added.
It is possible to suggest it was a wave based mode set on unique maps, a sandbox version of the campaign, or similar to the Battles of the Conquerors campaign from Age of Empires II, set in mythicalized historical battles, and mythical adventures of heroes.
Information on it is unknown, however it is NOT a form of the Arena map from Age of Empires II. Arena was a mode that was cut before release, before the Main Menu UI was changed.
