GoGrinder app analytics for December 25

GoGrinder is for practicing Go problems. Improving your reading is the fastest way to get stronger at Go, and solving problems is the best way to improve your reading. * Comes with 497 problems, and you can easily add your own collections. * Keeps track of % correct and average time on collections so you can track your progress. * Randomly rotates problems to encourage learning key shapes instead of memorizing problems.