You'll spend far more time watching ads than playing. Standard levels are way too easy and are usually over in about 10 seconds after which you have to watch a 30 second ad to progress. They have occasional timed boss levels, which at least look like a decent challenge, but the timer is short that they're impossible to pass and you have spend gold to get another 15 seconds. There's the option to remove the ads, but tbh the game just isn't designed well enough to warrant the price. Removed!