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My questions is mostly addressed to admin, but any help would be really aprrececiated. I have sequances of moves and before submmited them i checked here http://rodiongork.github.io/ColorBlocksJs/index_adv.html after the sequances af moves all cubes from demo gradually disapered and it is just normal, but when i submited the move to the chekere i received the message that "Move #2427 (3,1) is invalid!"
It's been months since I did this, but I think that happened to me and it really was an invalid move when I checked carefully (no cubes at that spot) and the demo page just stops instead of throwing an error