if you mean wizard101, i think 13-14 but some people l play battles and earn levels there, then do the missions. Most of the levels to get to places is all scrambled up. that's a hard question...
you have to be in about 11 or up
you HAVE to be level 13 or up
buy crowns
By colossus, if you mean the spell, you can either level up enough to get it or buy it as a treasure card, but in the bazaar it is so rare it only appears once in a while. If you are meaning the colossus pet, as if you saw all those high level ice wizards with the pet trailing them, then there is no way you can get it free, you would need to get a membership or crows to hit the level cap to get the pet.
Colossus boulevard is a member's only area open to those who have completed the main quests of Triton avenue, cyclops lane, and firecat alley. This is a free-to-player's introduction to colossus boulevard. I suggest you be level 10 or up to go into colossus boulevard, if you are any class but ice and fire. For ice, you should be level 13 or up. For fire, you should be 7 or up. BEWARE: The monster to player ratio is 2:1, so 2 monsters can battle one person.
You must complete cyclops lane and firecat alley, and then you can get to colossus boulevard
There are many colossus in wizard101. AKA sand colossus, magma colossus, etc, etc. There is a colossus boulevard to you have to finish all three streets in Olde Town
you dont help penny dreadful at all in any part of the game in colossus boulevard
In Colossus Boulevard which you can get to through the Shopping District.
The gobbler king is in the gobble stone castle in colossus boulevard.
To open Bartbly you have to complete Colossus Boulevard in Wizard City. Then Ambrose will tell you to go to Krokatopia using Bartbly. He will then open for you when you next talk to him. Hope this helped!! :)
in the shopping district when ur at the shopping disrict look at ur map and it will show u