How to let player move for specific number of times in gird base system.,Implement a move system in grid where player can move for specific number then dies if he did not meet game end/

Hello! i am new to unity and trying to create a puzzle game. In it i want to add some puzzle with moving boxes and dodge traps But i want my player character to have specific number of move to finish the puzzle if he does not he insta dies and return to the starting position but if he reaches to the end point in those specific number of moves he does not die.

Example: player get 12 moves to slove the puzzle if he does not reach end point then he insta die and start again but if he does reach the end point he does not die.

how do i code it??

Thankyou!