Based on some research and experience on the Larkiaro mini-game an addition of some sort of highlighter or button system to allow the player to mark squares on the Lakiaro Mini-Game seems necessary.  With this addition the user can 'X'-out or highlight boxes they do not want to click just yet or have them marked for later in the puzzle rather than having to guess which one of the squares it was previously that the player didn't want to click or wanted to save for a future click later in the puzzle. This system will help the player to make marks on their game board to help prevent mistakes and/or marking potential locations on the game board for the user. This system will help the user to better learn the mini-game and as well as help to prevent the loss of the best reward which is a guaranteed loss if you make one single click mistake on a deep dig during the mini-game. This mark system/button system could also be implemented into other parts of the game such as marking items on the mini map, when bookmarks are in full use. Consider this suggestion as this will help not only users on this mini-game but will be useful for other aspects of the world of Black Desert as well.