How can I analyze which level on which of three difficulty settings causes players to quit my game?

Question

I have a puzzle game with N stages where each stage has 3 difficulty levels. Users have to finish current unlocked stage to access next stage, but they can access any difficulty level for unlocked stage.

As example, User A played stage 1 with difficulty level EASY, then he changed the difficulty level to HARD and finished stage 2.

I'm using Flurry Analytics to log as above: "stage1_Completed_Easy" and "stage2_Completed_Hard"

The problem is: there could be more users completed stage N than those who sompleted stage N-1 As example, there are:

• 100 players completed stage1 EASY

• 50 players completed stage1 HARD

• 50 players completed stage2 EASY

• 25 players completed stage2 HARD
• 70 players completed stage2 NORMAL

I'm making assumption that each player only completed each stage once. This means from stage 1 to stage 2, I'm losing 5 players

I want to know which level and what difficulty that makes users stop playing my game

Answer 1

I actually do not know what level of liberty Flurry analytics give but you can, for example send and unique user_id with each event and with that remove people who played more than one level of difficulty or even count how many people retried what level. And with enough processing power you could generate a storyboard based on the events of you player, meaning: first they go to level 1 normal then half goes level 2 normal half goes level 2 hard.

Another solution is to send a counter for each player so you can do the same thing. That counter could increment each time you send a log to flurry. But once again that depends on your back-office