This level is currently nearly impossible to beat without boosters (or even with boosters). This is likely caused by a level buff, lack of moves, an objective which requires insane luck to fulfill, a level glitch, or a design error. This level is currently, or likely one of the hardest levels of the game.
Level 645 is the tenth level in Glazed Grove and the 133rd mixed mode level (93rd jelly-order). To pass this level, you must clear 81 double jelly squares and collect 144 toffee swirl layers in 23 moves or fewer.
When you complete the level, Sugar Crush is activated and will score you additional points.