Zuma

Firstly, make sure you know what a chain is: a chain is formed by combining two or more 3+ ball combinations of the same color with a single shot. Secondly, it is important to note that you are not required to make a chain with 20 balls of the same color or to make 20 chains with a single shot. All that is necessary is for you to make 20 chains in a row. This can be done with either 1 shot or 20 shots, the important thing is to just make sure they are all done consecutively.

* Glitch Note: This trophy is glitched and may unlock before or after you reach a total of 20x consecutive chains.