EPQ stands for Elevate Proficiency Quotient. A proficiency quotient tracks your performance. EPQ ranges from 0 to 5000 and is based on game performance, consistent training, and game variety. EPQ can increase, decrease, or stay the same depending on how your game scores compare to your historic performance and frequency of play. EPQ is based not just on the individual game but on all games in the same category (for example, all games in the Writing category).
Difficulty determines how challenging a game is based on your level of gameplay. When you take the onboarding test, you start at a difficulty level determined by your test results, which adapts as you progress to keep your experience challenging. Difficulty levels range from 0 to 800 for each game. If you're at an 800 difficulty level for a specific game, you'll still get new content and continue to earn EPQ.