Your `check()` is still completly hardcoded to have a dimension of 3x3. I think it's even worse, as in more hardcoded, than the previous one.

Your class has a constant `mDim`. Define your rows, columns and diagonals using that constant. The number of rows and collumns is determined by `mDim`. Also the length of each row, column and diagonal is determined by 'mDim'.

The same goes for `checkCondition()`. The 3 is hardcoded but should be governed by `mDim`.

Try making `mDim` selectable in the constructor and play a standard 3x3 game of Tic-Tac-Toe and a larger 4x4 game of Tic-Tac-Toe-Tuz to see if you have have removed the hardcoded 3 everywhere.

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If you want to go one step further you could remove the hardcoding of the board being a square and the board being 2 dimensional. Ever played 3D Tic-Tac-Toe?