Clan of Champions is a game that you can play with or against friends online. Each match will last around ten minutes. Of course, you can play this game by yourself, but you can ask for your friends' help with difficult missions, or fight against them as part of your training.
Only keys listed as "Region Free" can be redeemed in any country.
EU Keys can only be redeemed within the EU.
US Keys can only be redeemed within the USA.