Thank you for telling me about minesweeper. Also, I cant figure out if i can edit my review to add text to it(on mobile) so here:
Honestly, I loved that every puzzle made sense. Some were really hard to figure out, but I never felt like the correct way to find a solution was by brute-forcing my way through. Instead i just had to re-think and try to look at it in another way. I also enjoyed the bit of story in there. Definitely one of the best free games I have ever played and THE BEST calculator I have played :P. Oh, and I never encountered any bugs(as far as I know).