There is a food company that offers free vouchers of sandwiches if you are among the top scorers. The game can be hacked, and the hacker can change its source code and thus make it into the top scorer list. If the hacker wins by changing the game mechanics, will these sandwiches be halal for him or not? Please note that no rules and regulations have been defined for playing this game.

All perfect praise be to Allaah, The Lord of the worlds. I testify that there is none worthy of worship except Allaah and that Muhammad is His slave and Messenger.

If such hacking violates the terms and conditions of the owners of the game and those who offer the vouchers; then this hacking is not permissible and the hacker does not have the right to take those vouchers because he does not deserve them. Allaah Almighty says (what means): {O you who have believed, do not consume one another's wealth unjustly.} [Quran 4:29]

Allaah knows best.