itch.io

Thanks for the comment! I wanted the invisible numbers to be the main challenge, I assume you didn't like that part? Anyway, my initial intention was indeed to ramp up the difficulty progressively, with more types of operations, less time every level, and whatnot, with the invisible numbers maybe added a bit later, but at the end I didn't have time to add anything else and just had to rush and upload whatever I had.

i feel like it was the right call. Harder math operations would make it purely a math game which would be kinda boring. As it is its much harder but I still think its fun.