Level 20 to 30. I'm level 29 and need to get like 170 points without levelling to level 31 gonk
You attack monsters until they are almost dead and capture them with a rock. Too much like Pokemon... Anyway those give 1 jewel each. Bombing other players can drop their jewels which you can take. Bombs are annoying if you are ranked high and after being bombed, you are ranked near the bottom. It's usually hard to recover from it unless you bomb them back. Ranks are by the amount you have and points are rewarded accordingly. I don't know exactly how though, which is what I'm asking here.