i9 combines a total of 18 evidence-based working memory and executive control brain training games from cognitive neuroscience labs. Games include the classic (Jaeggi) dual n-back, XOR/AND/OR (‘feature integration’), Stroop, recursive, set-switching (multi-tasking), and movement and direction working memory games. Also the emotional dual n-back, and emotional Stroop n-back. Progression through games is based on training goal and performance. There are multiple speeds, multiple settings for interference control, facial expression performance feedback, error feedback, leaderboards and gamification. There are 10 sets of IQ problems with tutorials for problem solving skills and strategies. And there are valid, standardized IQ and cognitive tests for self-quantifying & tracking your training games.