I found a dataset called "GSM8K" (Grade School Math, >8k tasks) and made game with 3 modes: speed mode, endless mode and most hardcore - memory mode. In speed mode you need to correctly answer 5 questions as fast as possible. Memory mode is a mode in which every next word appears only after previous disappears; you starts with base speed of 1000, which increases by 25 each times you answer correctly and decreases by 50 each times you answer wrong. After 5 tasks it ends and new base speed saves.
This game is both speedreading and mental calculation trainer.
I used this dataset just for test, original purpose was to make somewhat similar but with more serious math tasks with many ranges of difficulty including olympiad level, so that as you progress in solving the problems, the difficulty of the problems increases. And with many fields like number theory, combinatorics, probability theory, geometry, algebra, calculus etc. So you can track your rating separately in different fields. If you know good datasets for this, please write.
2 options:
Super fast and simple, you don't need to pre-install anything.
(Unfortunately there are several false positives that virustotal gives to all exe files built with pyinstaller)
2) Download rar archive and run main.py file (but you need to install Python and several libraries)
So you can edit anything you want, even completely change dataset of tasks. Also you can use this option if you don't want to download exe file from some random guy from the Internet, which is pretty reasonable lol :D
You can watch the gameplay in the attached video.