Where is the Colosseum at all in Castlevania: Symphony of the Night (PlayStation)?

[GAMEBOYADVANCETEMPORARY]

castlevania.fandom.com/wiki/Colosseum says that the Colosseum contains the "Form of Mist" relic which is required to reach new rooms, places and zones in the castle that Alucard entered in the beginning of the game but this wiki page does not say how to get into this Colosseum nor where to find it in the castle.

I tried to find it by myself but I failed.

The wiki page does show a map of this Colosseum but it doesn't appear in my map.

Does anyone know where is this Colosseum in the castle and how to get into it please? I need this "Form of Mist" relic in order to proceed in the castle.

 

[AmandaRose]

To get to the Colosseum you need to go the the Clock Room. Once in there you need to wait for the statue on the left to open up, the statue will open and close with each passing minute.

When you enter the statue you will be in Olrox's quarters which will lead into the Colosseum.