Hi, thanks for playing and enjoying the game, and yes, the concept is to have patience and skill to gather as many as possible before casting the spell once and try to eliminate as many enemies as possible. and since several have tried it I saw that another factor that measures the game is how powerful your PC is to withstand the lag that generates thousands of monsters on the screen, it's not bad optimization or bug... noooo, it's part of the gameplay... yes it is ... xD!