DragonKey is a brain teasing game with 50 engaging levels of tantalizing puzzles. And if you think you have mastered it by completing a level, don’t be so sure; try solving it again for yourself.
It involves opening 50 doors and to each door you need to open multiple locks. The catch is that all the locks need to be in open position for the door to open and when you toggle all the locks surrounding also toggle their states.
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