One point could be gained from clearing the easy difficulty of level 1. Clearing the intermediate difficulty gave out five times that, and the hard difficulty gave out ten times the amount. Five points could be gained from clearing the easy difficulty of level 2, which was five times the previous level. Likewise, the intermediate difficulty provided 25 points, and the hard difficulty provided 50.

In order to raise your level, you needed to buy an experience point equivalent to the sum of points gained from clearing the three difficulties of a level. In other words, 16 points were needed to go from level 1 to 2, and 80 points were needed to go from level 2 to 3. This 5x ratio was maintained for every single level, so the points gained from each level increased exponentially, as well as the experience required to level up.

‘It’s similar to those old online games. At higher levels, you needed to earn more experience to go up a single level compared to the cumulative experience required to earn your current level from level 1.’

It sounded a little confusing, but I could sum it up in a few words. If you succeeded in clearing the intermediate difficulty of level 13 using my guide, you could reach level 13 in one go, even if you were originally level 1.

“I remember all the digits. 1,220,703,125 points. I learned all the skills that my grandson...