Coliseo UO
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Coliseo UO returns: the Ultima Online shard, now in your browser

We recovered Coliseo's world as it stood in 2023 to raise it again: the same Spanish-speaking Ultima Online shard, played in the browser, with nothing to install.

The Hall of Portals from above: pale and green flagstones, a walled garden in the middle and fire portals along the walls
The Hall of Portals, in the new client.

Coliseo UO was born in 2002 as a Spanish-speaking Ultima Online shard, built by hand by its people. It opened again in 2008 and once more in 2023. Now its biggest return begins: not another server to download and set up, but the whole of Coliseo, played from a browser tab, on a PC or a phone.

What we recovered

What we decided

A new server for the same world

The original Coliseo ran on Sphere 0.55i, a Windows server from 2001. We moved it to SphereServer X, which runs on Linux, with tools of our own that convert the saved world and the scripts. At first the new server did not know 1,028 kinds of item and 462 kinds of creature the world uses; after the conversion it knows all of them but one amulet, and the whole world loads: 189,761 objects and 8,850 creatures. The difference from the 2023 figures was the old server's own bookkeeping, which the new one keeps its own way.