Offer Real Money Problems
While playing this game would be exciting, it really tiring and time-consuming to upgrade and collect card of your characters. For example you must pay with gems only to get unique special cards, with greatly limiting to getting gems, this is major pain in the butt, or it will spend you real money. Most people use cr hack or cr cheats to avoid this loophole system.
Gold, Elixir Problem
Another problem is when you play cr, earning gold and elixir is little bit time consuming. Although you can play this for a year, then you will have great dominate account on your device. Gold and elixir can be earned by winning your battle in campaign mode or multiplayer mode, and participacing in quest, you must patience with it or you can spend real money to buy gems and use it to get gold or elixir.