Collect All is a special limited-time progressive reward chain. It allows you to obtain a series of high-value resources, such as Gold, Diamonds and Mythic Chest, by following a specific sequence of steps.

How does the reward progression work? 

The rewards follow an alternating pattern. You start by claiming a FREE reward. To unlock the next reward in the chain, you must purchase the current special offer. Once the purchase is made, the subsequent reward becomes FREE to claim. This "Free → Buy → Free" cycle continues until the end of the chain.

Why are some rewards locked with a padlock icon? 

The rewards are sequential. You cannot skip ahead. A reward remains locked until you have claimed or purchased the item immediately preceding it. Once you clear the current step, the padlock on the next reward opens automatically.

What does the timer at the top mean? 

This is a limited-time event! The timer ("Remaining...") shows exactly how much time you have left to participate. Once the timer hits zero, the "Collect All" event will disappear, and any unclaimed rewards in the chain will be lost.