Normally, competition problems get worked through in a fixed order, year by year, problem by problem, following whatever sequence the contest laid out. Some contests even sort by difficulty, so the ones near the end are the hardest. That's predictable, and predictable gets boring fast. Math-Gacha takes the same problem set and randomizes it. Spin, get a problem, set a timer, solve it. No fixed order, no knowing what's coming next. It's not just for solo practice, either. My friend and I used to battle over contest problems, whoever solved it first won. Math-Gacha works the same way: spin for the same problem, race the clock, see who gets there first.