Writing our Blueprints

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:

• Handle a turn-based mechanic
• Know when someone wins
• Show the state of the game
• Store a winning counter for each player
• Handle the restart

Turn-based mechanics

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...