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Unreal Engine Game Development Blueprints
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Now, we need to add some logic to this project. In order to achieve the tic-tac-toe mechanics and develop speaking, we need to do the following:
Open PuzzleBlock and PuzzleBlockGrid Blueprints as we are going to frequently switch between them.
First of all, we need to know which player has to move: the X or the O. In order to achieve this, also since this is a two-player game, we can use a simple Boolean variable that is stored on the PuzzleBlock grid class and grant it accessibility through the single block class.
Go to the grid class and add a new variable, call it IsX, and give its type as Boolean. From now, for our convenience, player 1 is always X and player 2 is O. Add Tooltip from the Details panel such as is player 1 and leave the other parameters as default:

Now, in order to check which player is playing from...
Change the font size
Change margin width
Change background colour