First, after we enter the game, we enter the building in the cave and find the corpse of the wizard inside.
Then search the wizard's corpse to get the wizard's robe.
After obtaining the wizard's robe, continue to pass the map. After the 50th floor, a hut will appear randomly on the map. Then put on the wizard's robe and enter the hut.
After entering the hut, we can purchase Cactus Gumball fragments by spending gold coins. If the fragments are enough, we can synthesize Gumball.
