Pros:
Pretty good story, excellent drawing, and the characters dont feel like cardboard cuttings.
Cons
some minor spelling mistakes here and there, small plotholes, and mc is pretty weird.
Spoilers/summary cause the synopsis didn't explain much
Mc gets a magic cup called the omnipotent grail with a goddess sealed in it, he has to take tests where he goes to different world inside the cups to complete a task (survive for X time, kill X people or X person etc.) The time inside the cup is different from outside so years could be only a night outside he keeps everything? he gains in the cup in the real world, he uses them in his everyday life such as making money and saving people, apparently there are some cultivation elements as well, it looks like it has a high chance of turning into a harem so dont read if you dont like that.
This is what I read so far tho so it might get better or worse